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Interaction between the embryo and endosperm affects seed development, an essential process in yield formation in crops such as rice. Signals that mediate communication between embryo and endosperm are largely unknown. We used the notched-belly (NB) mutant with impaired communication between embryo and endosperm to investigate the effect of the embryo on developmental staging of the endosperm and signaling pathways in the embryo that regulate endosperm development. Hierachical clustering of mRNA datasets from embryo and endosperm samples collected during development in NB and a wild type showed a delaying effect of the embryo on the developmental transition of the endosperm by extension of the middle stage. K-means clustering further identified coexpression modules of gene sets specific to embryo and endosperm development. Combined gene expression and biochemical analysis showed that T6P–SnRK1, gibberellin and auxin signaling by the embryo regulate endosperm developmental transition. We propose a new seed developmental staging system for rice and identify the most detailed signature of rice grain formation to date. These will direct genetic strategies for rice yield improvement.

Annickia affinis (Exell) Versteegh & Sosef, Syst. & Geogr. Pl. 77(1): 95, 2007 Figs 5, 7; Map 1B ≡ Enantia affinis Exell, J. Bot. 64, Suppl.: 9, 1926. Enantia chlorantha soyauxii = Enantia chlorantha (Oliv.) Setten & Maas var. soyauxii Engl. & Diels, Monogr. Afrik. Pflanzen.-Fam. 6: 70 1901. Type. Gabon. Estuaire, Munda, Sibange Farm, Soyaux H. 125, 21 Sep 1880: lectotype, designated by Versteegh and Sosef (2007), p. 95: B n.v.; isolectotypes: K[K001208605]; P[P00267979]. Type. Angola. Cabinda, Munze, ring at Buco Zau, Gossweiler J. 6675, 11 Sep 1916: holotype K[not seen]: isotypes: BM[BM000547034]; COI[COI00004913]; LISC[LISC000073, LISC000072, LISC000075, LISC000074]. Description. Tree, 3-30 m tall, d.b.h. 3-50 cm; stilt roots or buttresses absent, slash yellow. Indumentum of simple, bifid and fasciculate hairs; old leafless branches glabrous, young foliate branches sparsely pubescent. Leaves: petiole 2-8 mm long, 1-2 mm in diameter, sparsely pubescent, grooved, blade inserted on the side of the petiole; blade 3.5-26 cm long, 1.5-9.5 cm wide, elliptic to obovate, apex acuminate to acute, acumen 1 cm long, base narrowly cuneate to shortly attenuate, coriaceous to subcoriaceous, below pubescent when young and old with simple or bifid hairs pointing towards the leaf apex, above sparsely pubescent when young and old, concolorous; midrib sunken or flat, above sparsely pubescent to glabrous when young and old, below pubescent when young and old; secondary veins 8 to 13 pairs, sparsely pubescent below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, leaf opposed or extra axillary. Flowers with 6 perianth parts in 2 whorls, 1 per inflorescence; pedicel 7-14 mm long, 1-2 mm in diameter, pubescent; in fruit 27 mm long, 2-3 mm in diameter, pubescent; bracts 1-2, basal and one upper towards the middle of pedicel, ca. 4 mm long, ca. 2 mm wide; sepals 3, valvate, free, 7 mm long, ca. 4 mm wide, triangular, apex acute, base truncate, green, pubescent outside, glabrous inside, margins flat; petals free; outer petals absent; inner petals 3, valvate, 15-33 mm long, 5-15 mm wide, ovate to inversely Y-shaped ridged, apex acute, base broad and concave, greenish yellow, margins flat, pubescent outside, glabrous inside; stamens 110 to 175, in 5 to 6 rows, 2-4 mm long, linear; connective tongue shaped, glabrous, yellow; staminodes absent; carpels free, 35 to 70, ovary 3-4 mm long, stigma lobed, pubescent. Monocarps stipitate, stipes 10-40 mm long, 1-2 mm in diameter; monocarps 3 to 34, 20-35 mm long, 9-14 mm in diameter, ellipsoid to obovoid, apex sometimes mucronate, sparsely pubescent, smooth, glossy, black when ripe; seed 1, ca. 30 mm long, ca. 10 mm in diameter, ellipsoid; aril absent. Distribution. From Nigeria (one collection) to the Republic of Congo and the extreme west of the Democratic Republic of Congo; in Cameroon known from the East, South, Littoral, Center and South-West regions. Habitat. A very common species; in lowland rain forests in primary and secondary habitats. Altitude 50-650 m a.s.l. Local and common names known in Cameroon. Bololo, Bonuke, Bunuku bolobo (dial. Duala); Bululu, Mfo, Pobalo, Ufol, Moabé (dials. Ewondo, Bulu); M’Fo, Mofo, Mpuley (dial. Mab Kwasio, Foury 113, Service Forestier du Cameroun 84, Bates 1959); N’jie (Dials. Duala, Punu); Ogowa (Punguegaloa, De Wilde 8492); Moabi jaune (French); évué (dial. Bibaya, Baka). IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019a). Uses in Cameroon. medicine: bark as a malaria prophylaxis; construction: house building, furniture; dyes and tannins: as a yellow dye (Versteegh and Sosef 2007). Notes. Annickia affinis is distinguished by having overall glabrous branches and petioles and the lower side of the leaf blades which is sparsely pubescent with simple or bifid hairs pointing in the same direction. Annickia affinis is morphologically close to A. chlorantha from which it is distinguished by having a glabrous upper midrib surface (versus pilose in A. chlorantha). In addition, A. chlorantha has few simple hairs pointing in different directions combined with smaller bifid or trifid hairs. Annickia affinis is the most common species of Annickia and is generally found as a young plant in secondary forest, or as an adult in older secondary or primary forests. For a long time (and still now) Annickia affinis was confused with A. chlorantha (or even Enantia chlorantha), but the latter name is attributed to a different and rarer species (Versteegh and Sosef 2007). Thus, most literature refers to the old name A. (Enantia) Enantia chlorantha when referring to A. affinis (the common and widespread species). Previous reports of A. chlorantha outside Nigeria and Cameroon (e.g. Gabon) refer to A. affinis. Selected specimens examined. Central Region: near Ebolbom village 3 km est of Ngoumou 2 km north west of Otélé, 3.59°N, 11.28°E, 02 May 2013, Couvreur T.L.P. 426 (WAG,YA); Ottotomo Forest Reserve 3 km after reserve base near small loggers road, 3.66°N, 11.28°E, 02 May 2013, Couvreur T.L.P. 437 (WAG,YA); Mefou Proposed National Park, 3.62°N, 11.57°E, 15 March 2004, Etuge M. 5139 (K,YA); Mbam Minkom, 3.96°N, 11.36°E, 19 September 2013, Kamdem N. 143 (YA); Nguila 1, 4.77°N, 11.75°E, 30 April 2017, Kamdem N. 521 (YA); Colline entre Tcherikoy et Sokelle II (30 km NW Eséka), 3.78°N, 10.96°E, 14 December 1973, Letouzey R. 12361 (P,YA). East Region: 77 km south of Yokadouma 30 km after Ngato 15 km after river ALPICAM 'base de vie’ then 40 km on forestry road starting 4 km before Maséa village, 3.15°N, 14.72°E, 05 March 2019, Couvreur T.L.P. 1203 (MPU,WAG,YA); Deng Deng, 5.21°N, 13.44°E, 19 April 2016, Kamdem N. 422 (YA); 16 km E de Dimako, 4.38°N, 13.57°E, 15 December 1965, Leeuwenberg A.J.M. 7355 (BR,K,MO,P,PHA,WAG,YA); 15 km E of Dimako, 4.38°N, 13.57°E, 08 February 1966, Leeuwenberg A.J.M. 7787 (BR,C,K,MO,P,WAG,YA); Route Mintom I (70 km E de Djoum)- Alati (100 km SE de Djoum)-PK 63, 2.83°N, 13.35°E, 01 January 1973, Letouzey R. 11751 (P,YA). Littoral Region: Ebo Wildlife Reserve Djuma permanent camp On Djuma-Djuma trail, 4.33°N, 10.24°E, 14 February 2014, Couvreur T.L.P. 621 (WAG,YA); Mambe Massif above Boga village 100 km along road from Yaoundé to Ed 3.90°N, 10.77°E, 20 June 2014, Couvreur T.L.P. 657 (WAG,YA). South Region: Ebolowa, 2.96°N, 11.28°E, 01 January 1925, Bates G.L. 1959 (BM,BR,MO); on road Lolodorf-Bipindi ca half way near Mbiguiligui village (Mbikiliki), 3.16°N, 10.53°E, 26 February 2018, Couvreur T.L.P. 1153 (P,WAG,YA); 22 km east from Lélé village, 3.26°N, 10.10°E, 07 September 2013, Couvreur T.L.P. 469 (WAG,YA); ca 15 km east from Lélé village, 2.26°N, 13.29°E, 09 September 2013, Couvreur T.L.P. 492 (WAG,YA); Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.47°N, 10.33°E, 11 February 2015, Couvreur T.L.P. 671 (WAG,YA); A 6 km à l’ouest de Masea (village situé à 50 km au SSW de Yokadouma), 3.14°N, 14.86°E, 05 July 1963, Letouzey R. 5412 (P,YA); Campo-Ma’an area road Nko-elon-Mvini Akok Beryat rock, 2.36°N, 10.25°E, 30 June 2001, van Andel T.R. 3784 (KRIBI,WAG,YA); Bipindi, 3.08°N, 10.42°E, 01 January 1909, Zenker G.A. 3839 (BM,BR,K,MO,P). South-West Region: Ekundu Kundu, 5.15°N, 8.883°E, 30 April 1996, Cheek M. 8297 (K,WAG,YA); Mungo river forest reserve North of Kumba-Tombel road entered ca 05 km West of Mungo bridge, 4.73°N, 9.55°E, 24 October 1998, Cheek M. 9354 (YA); Foot of Nyale Rock, 4.98°N, 9.616°E, 17 November 1998, Cheek M. 9654 (K,YA); on trail through palm oil plantation 3 km before lava flow and Seme Beach hotel when coming from Limbe, 4.05°N, 9.076°E, 18 October 2013, Couvreur T.L.P. 519 (WAG,YA); Kupe village to Loum State Forest, 4.73°N, 9.716°E, 30 May 1996, Etuge M. 2049 (K,WAG,YA); Nyale forest and rock, 5°N, 9.633°E, 15 February 1998, Etuge M. 4235 (K,YA); Edensueh forest, 5.25°N, 9.576°E, 30 November 2000, Etuge M. 4850 (K); Kumba-Mbonge road 500 m W of Meme River bridge between Bole and Mabonji, 4.55°N, 9.25°E, 07 July 1986, Thomas D.W. 6327 (MO); Baro village, 5.27°N, 9.21°E, 03 March 1988, Thomas D.W. 7494 (K,MO,P,WAG).

Monanthotaxis montana (Engl. & Diels) P.H.Hoekstra, Taxon 66: 15, 2017 Figs 59, 64; Map 8F ≡ Unona montana Engl. & Diels, Notizbl. Königl. Bot. Gart. Berlin 2: 296, 1899; Oxymitra montana (Engl. & Diels) Sprague & Hutch., Bull. Misc. Inform. Kew: 155, 1916; Richella montana (Engl. & Diels) R.E.Fr., in Prantl. & Engler Nat. Pflanzenfam. ed. 2, 17a (2): 139, 1959; Friesodielsia montana (Engl. & Diels) Steenis, Blumea 12: 360 1964. = Unona glauca Engl. & Diels (non Zipp.), Notizbl. Königl. Bot. Gart. Berlin 2: 296, 1988; Oxymitra soyauxii Sprague & Hutch., Bull. Misc. Inform. Kew 6: 155, 1916; Richella soyauxii (Sprague & Hutch.) R.E.Fr., in Prantl. & Engler Nat. Pflanzenfam., ed. 2, 17a (2): 139, 1959. - Friesodielsia soyauxii (Sprague & Hutch.) Steenis, Blumea 12: 361, 1964. Type. Gabon. Estuaire, Sibange farm, Soyaux H. 203, 6 Feb 1881: lectotype, designated by Guo et al. (2017b), p. 15: B[B100153059]; isolectotype: K[K000198946]. = Oxymitra mortehanii De Wild., Pl. Bequaert. 1: 472, 1922. Type. Democratic Republic of the Congo. Mongala, Dundusana, Mortehan M.G. 512, Sep 1913: holotype: BR[BR000008800459, BR000008800060, BR000008800787]. Type. Cameroon. Central Region; Yaoundé-Station, Zenker, G.A. 431, 11 Jan 1894: holotype: B[B100153061]. Description. Shrub to liana, up to 7 m tall, d.b.h. up to 1 cm. Indumentum of simple hairs; old leafless branches glabrescent, young foliate branches densely pubescent with dense appressed to ascending reddish brown hairs 0.2-0.3 mm long. Leaves: petiole 3-6 mm long, 1-2 mm in diameter, densely pubescent, slightly grooved, blade inserted on top of the petiole; blade 5.5-20 cm long, 2.8-6.7 cm wide, elliptic to oblanceolate, apex acuminate to acute, acumen 1.5 cm long, base subcordate, subcoriaceous, below pubescent when young and old, above sparsely pubescent to glabrous when young and old, grey when dried, discolorous, whitish below; midrib impressed, above sparsely pubescent when young, glabrous when old, below pubescent when young and old; secondary veins 7 to 13 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on old leafless branches, extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 4 per inflorescence; pedicel 13-33 mm long, 0.5-1 mm in diameter, sparsely pubescent; in fruit 28-38 mm long, 0.5-1 mm in diameter; basal bract ca. 1 mm long, ca. 1 mm wide; upper bract ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, reflexed at anthesis, 1-2 mm long, 1-2 mm wide, broadly elliptic to broadly ovate, apex acute, base truncate, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner, inner petals entirely covered in bud; outer petals 3, 6-15 mm long, 5.4-6.7 mm wide, ovate, apex obtuse, base truncate, yellow-green and red at the base, margins flat, sparsely pubescent outside, pubescent with a glabrous base inside; inner petals 3, valvate, 5.8-7.5 mm long, 4.5-9 mm wide, cordate, apex obtuse, base truncate, margins flat, glabrous outside, glabrous inside; stamens 36 to 48, in 5 rows, ca. 1 mm long, linear to oblong; connective truncate, glabrous; staminodes absent; carpels free, 11 to 14, ovary 1-2 mm long, stigma globose, glabrous. Monocarps stipitate, stipes 3-8 mm long, 2-3 mm in diameter; monocarps 4 to 11, 12-33 mm long, 4-9 mm in diameter, moniliform, ellipsoid, apex rounded to apiculate, pubescent to glabrous, verrucose, constricted around seeds when more than 1, yellow with red stripes or dull red when ripe; seeds 1 to 3 per monocarp, 11-12 mm long, 5-6 mm in diameter, ellipsoid; aril absent. Distribution. A central African species from Cameroon to the Democratic Republic of the Congo, Central African Republic and Angola; in Cameroon known from the Central and South-West regions. Habitat. A rare species in Cameroon, only known from two collections; in primary or old secondary rain forests, swamp forests, gallery forests, on rocky soil and along river banks. Altitude: 500-700 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Least Concern (LC) (Hoekstra et al. 2021). Uses in Cameroon. None reported. Notes. Monanthotaxis montana is distinguished by the upper side of the leaf blade which is grey in dried material, sepals that are small (1-2 mm long) and reflexed at anthesis, and stamens 36 to 48 in 5 rows. Specimens examined. Central Region: Yaoundé, 3.86°N, 11.51°E, 1894, Zenker G.A. 431 (B). South-West Region: Njonji, 4.13°N, 9.033°E, 17 April 1997, Nning J. 360 (K,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 221-223, DOI: 10.3897/phytokeys.207.61432, {"references":["Guo, X, Hoekstra, PH, Tang, CC, Thomas, DC, Wieringa, JJ, Chatrou, LW, Saunders, RM, 2017b. Cutting up the climbers: Evidence for extensive polyphyly in Friesodielsia (Annonaceae) necessitates generic realignment across the tribe Uvarieae. Taxon 66: 3 - 19, DOI: https://doi.org/10.12705/661.1","Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01"]}

Piptostigma macrophyllum Ghogue, Sonké & Couvreur, Pl. Ecol. Evol. 150 (2): 199, 2017 Fig. 89; Map 11E Type. Cameroon. South-West Region; above small Koto village (Mt. Cameroon), Thomas D.W. 4493, 6 Mar 1985: holotype: YA[YA0002852]; isotypes: MO[MO3282523]; P[P00284016]. Description. Tree, 5-10 m tall, d.b.h. 10-20 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 6-7 mm long, 3-4 mm in diameter, pubescent, cylindrical, blade inserted on top of the petiole; blade 25-41 cm long, 9-16 cm wide, obovate, apex acuminate, acumen ca. 2.5 cm long, base acute, papyraceous, below glabrous when young and old, above sparsely pubescent when young, sparsely pubescent when old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below sparsely pubescent when young and old; secondary veins 21 to 28 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous or ramiflorous on old leafless branches, axillary, pubescent all over, peduncle like base 5-10 mm long, axial internodes 5-15 mm long, compact to sub-lax, sympodial rachis up to 70 mm long. Flowers with 9 perianth parts in 3 whorls, 3 to 6 per inflorescence; pedicel 8-10 mm long, ca. 2 mm in diameter, tomentose; in fruit 10-12 mm long, ca. 4 mm in diameter, glabrous; basal bract ca. 12 mm long, ca. 3 mm wide; upper bract ca. 12 mm long, ca. 3 mm wide; sepals 3, valvate, free, ca. 9 mm long, ca. 3 mm wide, ovate, apex acute, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, 9-15 mm long, 2.5-3 mm wide, narrowly elliptic, apex acute, base truncate, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 25-35 mm long, 4-5 mm wide, ovate, apex acute, base truncate, margins wavy, pubescent outside, pubescent inside; stamens numerous, in 6 to 8 rows, 1-2 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, ca. 5, ovary ca. 3 mm long, stigma globose, densely pubescent. Monocarps sessile, 1 to 3, ca. 33 mm long, ca. 35 mm in diameter, globose, apex rounded, glabrous, verrucose to muricate with short projections, not ribbed, light red pink when ripe; seeds 2 to 4 per monocarp, 10-15 mm long, ca. 12 mm in diameter, ellipsoid; aril absent. Distribution. endemic to Cameroon, known from the South, Littoral and South-West regions. Habitat. A rare species; in primary or secondary lowland or premontane rain forests on black volcanic soils, sometimes in plantations. Altitude 550-1000 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Vulnerable B2ab(iii,iv) (Cosiaux et al. 2019a l). Uses in Cameroon. None reported. Notes. Piptostigma macrophyllum is morphologically close to P. pilosum by the large size and papery consistency of its leaf blade. However, the leaf blades of P. pilosum are mostly oblong or elliptic and only exceptionally narrowly obovate like those of P. macrophyllum. The inflorescences of P. pilosum are also less compact and less pubescent than those of P. macrophyllum. The monocarps of P. macrophyllum strongly resemble those of P. multinervium and P. macranthum being muricate to verrucose in texture with short projections. Piptostigma macrophyllum is distinguished from P. multinervium by its larger size of the leaf blades (25-41 cm long versus 13-21 cm long in P. multinervium), the lower side of the leaf blades being glabrous between the veins in P. macrophyllum and pubescent in P. multinervium; finally the sepals are narrowly ovate in P. macrophyllum while broadly triangular in P. multinervium. From P. macranthum it is distinguished by the leaves being obovate (versus narrowly oblong to oblong). Specimens examined. Littoral Region: Ebo Forest Reserve Djuma permanent camp on transect 5, 4.33°N, 10.23°E, 16 February 2013, Couvreur T.L.P. 637 (WAG,YA). South Region: Bord de la Lobé 25 km E Campo, 2.37°N, 9.82°E, 01 January 1968, Letouzey R. 9156 (P,YA). South-West Region: Mount Cameroon National Park Bakinguili trail above Bakinguili village, 4.09°N, 9.054°E, 02 April 2016, Couvreur T.L.P. 1034 (WAG,YA); on trail through palm oil plantation 3 km before lava flow and Seme Beach hotel when coming from Limbe, 4.06°N, 9.079°E, 18 October 2013, Couvreur T.L.P. 518 (WAG,YA); Entre DikomeBalue (1200 m) et Ifanga Nalende (650 m) 35 km NNW-Kumba, 4.9°N, 9.29°E, 25 March 1976, Letouzey R. 14590 (P,YA); Etinde forest reserve Njonji lake, 4.13°N, 9.033°E, 25 January 1993, Tchouto Mbatchou G.P. 1053 (K); Disturbed forest Bomana and Koto II, 4.3°N, 9.05°E, 26 April 1996, Tchouto Mbatchou G.P. 1378 (K,YA); Mount Cameroon above small Koto village, 4.3°N, 9.1°E, 06 March 1985, Thomas D.W. 4493 (YA); Between Ikenge and Esukutang ca 6 kms West of Ikenge, 5.28°N, 9.083°E, 03 April 1988, Thomas D.W. 7645 (YA); Cameroon Mountain, 4.12°N, 9.029°E, 20 June 2001, van Andel T.R. 3728 (U,WAG)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 294-295, DOI: 10.3897/phytokeys.207.61432, {"references":["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019a. Annickia affinis. The IUCN Red List of Threatened Species: e.T132512369A132513599. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132512369A132513599.en"]}

Artabotrys insignis var. batesii Le Thomas Adansonia, ser. 2, 5: 448, 1965 Fig. 14; Map 2F Type. Cameroon. East Region; Bitya, near Dja river, Bates G.L. 1792, Sep 1922: holotype: P[00363370]. Description. Differs from the type variety by its densely brown tomentose and shortly hirsute branches and petioles, pubescent lower side of leaf blades and tomentose petals. Distribution. A west and central African species, from Sierra Leone to Benin and from Cameroon to the Democratic Republic of the Congo; in Cameroon known from Central, East, South and South-West regions. Habitat. A fairly common species in Cameroon, in secondary rain forests a long fringes of forests, in swampy regions too. Altitude 100-800 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not evaluated. Uses in Cameroon. None recorded. Notes. Differences between var. Artabotrys insignis insignis and var. Artabotrys insignis batesii are quite small, and are mainly related to the pubescence of the branches, lower side of the leaves and petals (Le Thomas 1965a). There is one more recognized variety within Artabotrys insignis: var. Artabotrys insignis concolor (Pellegr.) Le Thomas which differs by having shiny leaves on both sides and longer sepals. We have not seen this variety in Cameroon, but it is present in Gabon (Le Thomas 1965a, 1969b). Specimens examined. East Region: Village Djang 40 km west of Bertoua, 4.58°N, 13.35°E, 15 May 1962, Breteler F.J. 2956 (P,WAG). South Region: Bitye near R Ja, 3.02°N, 12.37°E, 01 September 1922, Bates G.L. 1792 (P); Rive du Ntem à Ebianemeyong 60 km east de Campo, 2.42°N, 10.33°E, 12 April 1970, Letouzey R. 10370 (P,WAG,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 67-69, DOI: 10.3897/phytokeys.207.61432, {"references":["Le Thomas, A, 1965a. Notes sur quelques Annonacees ouest-Africaines. Adansonia 5: 443 - 454","Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371"]}

Piptostigma submontanum Ghogue, Sonké & Couvreur, Pl. Ecol. Evol. 150 (2): 208, 2017 Fig. 92; Map 12B Type. Cameroon. South-West Region; Rumpi Mountains, between Lokando and Dikome Balue, 30 km NNW Kumba, Letouzey R.G. 14535, 23 Mar 1976: holotype: YA[YA0002870]; isotype: P[P02032181]. Description. Tree, up to 25 m tall, d.b.h. up to 20 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches sparsely pubescent, young foliate branches tomentose. Leaves: petiole 2-4 mm long, 2 mm in diameter, tomentose, cylindrical, blade inserted on top of the petiole; blade 40-49 cm long, 16-23 cm wide, obovate, apex acuminate to mucronate, acumen 0.8-1.3 cm long, base decurrent to cuneate and narrowly cordate, coriaceous, below densely pubescent when young, densely pubescent when old, above pubescent when young, glabrous when old, discolorous, whitish below; midrib impressed, above pubescent when young and old, below pubescent when young and old; secondary veins 58 to 65 pairs, sparsely pubescent above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous, peduncle like base 10-18 mm long, axial internodes 2-5 mm long, compact, sympodial rachis 20-40 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 4 per inflorescence; pedicel 2-6 mm long, 2-3 mm in diameter, tomentose; in fruit ca. 25 mm long, ca. 4 mm in diameter, tomentose; basal bract 7-8 mm long, ca. 4 mm wide; upper bract 4-6 mm long, ca. 6 mm wide; sepals 3, valvate, free, 5-8 mm long, ca. 5 mm wide, ovate, apex acute, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, ca. 5 mm long, ca. 4 mm wide, ovate, apex acute, base truncate, light yellow to red, margins flat, densely pubescent outside, glabrous inside; inner petals 3, valvate, 50-60 mm long, 5-7 mm wide, narrowly elliptic, apex acute, base truncate, margins wavy, densely pubescent outside, glabrous inside; stamens numerous, in 6 to 8 rows, 1 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 12 to 15, ovary ca. 2 mm long, stigma globose, pubescence not seen. Monocarps sessile, 1 to 2, 20-30 mm long, 10-25 mm in diameter, obovoid, apex rounded, tomentose, bumpy, brown when ripe; seeds 6 to 8 per monocarp, 6-12 mm long, 3-5 mm in diameter, ellipsoid; aril absent. Distribution. Endemic to Cameroon; known from the South-West and Littoral regions. Habitat. A fairly uncommon species; in submontane rain forests. Altitude 900-1200 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Endangered (EN) (Cosiaux et al. 2019a r). Uses in Cameroon. None reported. Notes. See under P. calophyllum. Specimens examined. Littoral Region: Ebo Forest Reserve Djuma camp Djashaka trail, 4.36°N, 10.25°E, 15 February 2013, Couvreur T.L.P. 625 (WAG,YA). South-West Region: Edip to Kodmin ca 1 hour’s walk, 4.96°N, 9.666°E, 02 December 1998, Cheek M. 9177 (K,P,WAG,YA); Mount Kupe Kodmin, 4.96°N, 9.683°E, 21 November 1998, Gosline W.G. 198 (K,P,WAG,YA); Abang road and then right to forest, 4.93°N, 9.731°E, 11 December 1999, Gosline W.G. 256 (K,MO,WAG,YA); Entre Lokando (900 m) et Dikome Balue (1200 m) 30 km NNW-Kumba, 4.85°N, 9.28°E, 23 March 1976, Letouzey R. 14535 (P,YA); Rumpi Hills near Madie River, 4.94°N, 9.123°E, 22 February 1995, Thomas D.W. 10496 (K).

Isolona cooperi Hutch. & Dalziel ex G.P.Cooper & Record, Bull. Yale Univ. School For. No. 31: 15, 1931 Fig. 35; Map 5B Type. Liberia. Montserrado; near Firestone plantations, along Dukwai road, Cooper G.P. 417, 7 May 1929: lectotype, designated by Couvreur (2009), p. 148: GH[GH00286760]; isotypes: F[F0093217]; FHO[FHA00095994]; G[GH00286760]; K n.v.; NY[NY00026103]; WIS[WIS00000299MAD]. Description. Tree, 6-18 m tall, d.b.h. 20 cm; stilt roots or buttresses absent. Indumentum absent; old leafless branches glabrous, young foliate branches glabrous. Leaves: petiole 1-5 mm long, 2-3 mm in diameter, glabrous, grooved, blade inserted on top of the petiole; blade 15-29 cm long, 6-15 cm wide, oblong to obovate, apex acuminate, acumen 1-2 cm long, base cuneate to rounded, subcoriaceous, below glabrous when young and old, above glabrous when young and old, concolorous; midrib raised, above glabrous when young and old, below glabrous when young and old; secondary veins 9 to 18 pairs, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences cauliflorous or ramiflorous on young foliate branches, axillary. Flowers with 9 perianth parts in 2 whorls, 1 to 2 per inflorescence; pedicel 14-25 mm long, 1 mm in diameter, glabrous; in fruit 16-27 mm long, 2 mm in diameter, glabrous; bracts 2 to 4, all basal, 1 mm long, 1mm wide; sepals 3, valvate, free, 2 mm long, 2 mm wide, ovate, apex rounded, base truncate, green, glabrous outside, glabrous inside, margins flat; petals basally fused, tube 6-11 mm long, inner and outer whorl not differentiated, equal; lobes 8-15 mm long, 4-6 mm wide, oblong, apex acute to rounded, green, margins flat, glabrous outside, glabrous inside, spreading horizontally; stamens numerous, in 3 to 4 rows, 2 mm long, broad; connective discoid, glabrous, green; staminodes absent; carpels fused into a single structure, 3 mm long, stigma capitate, glabrous. Fruit syncarpous, sessile, 30-90 mm long, 15-30 mm in diameter, ellipsoid, apex apiculate, glabrous, smooth, constricted over seeds in dried material, smooth when fresh, orange with white spots when ripe; seeds not counted, 10-15 mm long, 5-10 mm in diameter, ellipsoid; aril absent. Distribution. A mainly West African species, from Liberia to Ghana, with a few specimens from Cameroon and one from Gabon; in Cameroon known from South and South-West regions. Habitat. A rare species in Cameroon; in lowland primary and secondary forests, also along rivers, on sandy soils. Altitude 0-300 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019r). Uses in Cameroon. None reported. Notes. Isolona cooperi is distinguished by its completely glabrous leaves, young foliate branches and flowers and with the leaf blade inserted on top of the petiole. In addition, the flowers emit a very strong sweet scent, noticeable even in dried material. It has a smooth corolla in dried material and corolla lobes with straight margins. Isolona cooperi is similar to I. hexaloba by the shape of its flowers, but the latter differs by its blade inserted sideways to the petiole and the absence of the strong sweet scent. Finally, I. cooperi resembles I. campanulata by the shape of the fruits. Specimens examined. South Region: Bipindi, 3.08°N, 10.41°E, 01 February 1910, Zenker G.A. s.n. (F). South-West Region: Korup National Park, 5.06°N, 8.855°E, 10 March 1998, Kenfack D. 1063 (MO,WAG)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 137-139, DOI: 10.3897/phytokeys.207.61432, {"references":["Couvreur, TLP, 2009. Monograph of the syncarpous African genera Isolona and Monodora (Annonaceae). Systematic Botany Monographs 87: 1 - 150","Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019r. Isolona cooperi. The IUCN Red List of Threatened Species: e.T132677030A132678219. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132677030A132678219.en"]}

Annona L., Sp. Pl. 1: 536, 1753 Guanabanus = Guanabanus Mill. Gard. Dict. Abr., ed. 4: 2, 1754. Type species. Annona muricata L. Description. Trees, 1-10 m tall, d.b.h. 2-10 cm; stilt roots or buttresses absent. Indumentum of simple hairs. Leaves: petiole 7-20 mm long, 1-3 mm in diameter, blade 6-25 cm long, 4-19 cm wide, broadly obovate or obovate to broadly elliptic to elliptic, apex rounded or obtuse or shortly emarginated, base subcordate to rounded, discolorous, whitish below or concolorous; midrib sunken or flat; secondary veins 7 to 16 pairs; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young and old leafless branches, leaf opposed. Flowers with 9 perianth parts in 3 whorls, 1 to 2 per inflorescence; flowering peduncle sometimes present, short; pedicel 10-25 mm long; in fruit 15-50 mm long; bracts 2, all basal, 1-5 mm long; sepals 3, valvate, free, 3-4 mm long, triangular to ovate, apex acute, base truncate; petals free; outer petals longer than inner; outer petals 3, valvate, 10-15 mm long, 8-10 mm wide, ovate, apex acute, base truncate; inner petals 3, valvate, 8-10 mm long, 3-4 mm wide, narrowly oblong or narrowly elliptic, apex acute to obtuse, base truncate; stamens numerous (not counted), in 2 to 3 rows, 2-3 mm long, linear; connective discoid, shortly pubescent; staminodes absent; carpels free, numerous (not counted), ovary 1-2 mm long, stigma capitate, glabrous or pubescent. Fruit pseudosyncarpous, 20-50 mm long, 20-50 mm in diameter, obovoid to globose; monocarps sessile, completely fused between them, numerous (not counted); seed 1, 8-10 mm long, 4-5 mm in diameter, flattened ellipsoid, irregular in shape; aril absent. A mainly South American genus, one of the largest in Annonaceae with about 170 accepted species (Rainer 2001). In Africa, there are between three or four native species, with numerous subspecies and varieties and of which the taxonomy remains complicated (Robyns and Ghesquière 1934; Sillans 1952; Le Thomas 1969c). Annona glabra L. is probably of South American origin (Le Thomas 1969b, 1969c) but is naturalized along the coast of West and Central Africa. In Cameroon it is also found in mangrove areas, but is little collected (e.g. van der Burgt 130 (WAG)) We thus include it in the key, but do not provide a description. In addition, this genus contains the non-native edible species Annona squamosa L., A. muricata L. and A. reticulata L. (from South America), all of which can be found in cultivation (not included in the descriptions) in Cameroon. Taxonomy. no recent revision, but see Le Thomas (1969c), Le Thomas (1969b).

Uvariodendron calophyllum R.E.Fr., Acta Horti Berg. 10: 63, 1930 Fig. 121; Map 15C Type. Cameroon. South Region; Bipindi, Zenker G.A. 2344, 1901: holotype: B[B 10 0153116]; isotypes: BM[BM000636669]; G[G00412241]; GOET[GOET005732]; HBG[HBG502513]; K[K000198797, K000198796]; M[M0107940]; P[P00362661, P00362658, P00362659]; S[S07-13396, S07-13393]; WAG[WAG.1418666]. Description. Tree, 2-20 m tall, d.b.h. 20-35 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches sparsely pubescent, young foliate branches densely pubescent to brown tomentose. Leaves: petiole 4-25 mm long, 2-9 mm in diameter, densely pubescent to brown tomentose, slightly grooved, blade inserted on top of the petiole; blade 25.8-76.5 cm long, 6.1-24.8 cm wide, oblong to obovate, apex acuminate to emarginate, acumen 0.6-3.2 cm long, base rounded, coriaceous, below glabrous to pubescent at base when young and old, above glabrous when young and old; midrib sunken or flat, above glabrous when young and old, below densely pubescent when young and old; secondary veins 19 to 40 pairs per side, glabrous above, slightly pubescent to pubescent below; tertiary venation reticulate. Individuals bisexual; inflorescences cauliflorous or ramiflorous on old or young foliate branches, axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 3 per inflorescence; pedicel 0-9 mm long, 4-7 mm in diameter, tomentose; in fruit 1-9 mm long, ca. 4-7 mm in diameter, tomentose; bracts 2-6, several basal and one upper towards the middle of pedicel, basal bracts 2-3 mm long, 1-3 mm wide; upper bract 10-23 mm long, 10-40 mm wide; sepals 3, valvate or imbricate, basally fused, 10-27 mm long, 10-26 mm wide, ovate, apex acuminate, base truncate, brown, densely pubescent to brown tomentose outside, pubescent except towards center inside, margins flat; petals free, sub equal; outer petals 3, 15-37 mm long, 10-28 mm wide, ovate, apex acuminate, base truncate, greyish yellow, margins flat, densely pubescent to brown tomentose outside, glabrous but pubescent towards margins inside; inner petals 3, valvate, 14-34 mm long, 11-20 mm wide, ovate, apex acuminate, base truncate, light yellow to cream, margins flat, densely pubescent to brown tomentose outside, pubescent towards margins inside; stamens 3680 to 5256, in 25 to 35 rows, 3.5-4.5 mm long, linear; connective discoid, glabrous, cream; staminodes absent; carpels free, 23 to ca. 150, ovary 4-5 mm long, stigma bilobed, slightly capitate, densely pubescent. Monocarps sessile to stipitate, stipes 0-5 mm long, 2.5-3 mm in diameter; 3 to 35 monocarps, 27-55 mm long, 9-25 mm in diameter, ellipsoid, apex rounded, tomentose, bumpy, otherwise smooth, brown when ripe; seeds 7 to 13 per monocarp, ca. 13 mm long, 8-10 mm in diameter, ellipsoid to oblong; aril absent. Distribution. A widespread species with a disjunct distribution in West and Central Africa, from Côte d’Ivoire to Ghana, and from Nigeria to Cameroon. In Cameroon known from the South, Central, Littoral, South-West and North-West regions. Habitat. A fairly common species; in lowland primary or old secondary rain forests, near streams. Altitude 50-30 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019a f). Uses in Cameroon. None reported. Notes. Uvariodendron calophyllum is distinguished by a dense brown tomentose pubescence on the young foliate branches, petioles, flowering pedicels, and outer side of the sepals and petals. Uvariodendron fuscum var. giganteum also has a dense pubescence on the young foliate branches, but the hairs are long and white, and soon disappearing with age. Stamen count was taken from Meinke (2008). Specimens examined. Central Region: Sonossi 26 km W of Ndikinimeki, 4.77°N, 10.83°E, 29 March 1982, Asonganyi J.N. 421 (P,YA); Colline entre Tcherikoy et Sokelle II (30 km NW Eséka), 3.80°N, 10.56°E, 14 December 1973, Letouzey R. 12352 (P,YA). Littoral Region: 8 km W of Masok, 4.13°N, 10.4°E, 31 March 1965, Leeuwenberg A.J.M. 5282 (BR,K,MO,P,WAG,YA). North-West Region: Baji-Tumbo (Wum), 6.38°N, 10.07°E, 12 July 1975, Letouzey R. 14020 (K,P,WAG,YA); Bamenda Prov Wum Distr Nkom-Wum FR, 6.26°N, 10.13°E, 03 July 1951, Ujor E.U. 29281 (K). South Region: on road Lolodorf-Bipindi ca half way near Mbiguiligui village (Mbikiliki), 3.16°N, 10.53°E, 26 February 2018, Couvreur T.L.P. 1157 (K,MPU,P,WAG,YA); 31 km east from Lélé village, 2.27°N, 13.29°E, 09 September 2013, Couvreur T.L.P. 486 (WAG,YA); ca 7 km NE of Ebom, 3.11°N, 10.75°E, 01 August 1996, Parren M.P.E. 223 (KRIBI,WAG); ca 7 km NE of Ebom, 3.11°N, 10.75°E, 01 August 1996, Parren M.P.E. 68 (KRIBI,WAG); Bipindi, 3.08°N, 10.42°E, 1898, Zenker G.A. 1738 (B,M,P,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1901, Zenker G.A. 2344 (B,L,M,P,WAG); Bipindi, 3.08°N, 10.42°E, 01 April 1903, Zenker G.A. s.n. (P). South-West Region: Along the path from Pete to Bopo at the right hand side of the road in S Bakundu FR, 4.46°N, 9.392°E, 23 February 1956, Binuyo A. 35564 (K,WAG); Mungo river forest reserve ca 1 km East of bridge Chained road to S, 4.73°N, 9.55°E, 24 October 1998, Cheek M. 9337 (K,YA); Bayang Mbo Wildlife Sanctuary after Mbu river, 5.35°N, 9.500°E, 26 March 2016, Couvreur T.L.P. 1013 (WAG,YA); on top of hill near Small Ekombe village 3 km after Kumba on road to Ekondo Titi town, 4.62°N, 9.376°E, 13 January 2016, Couvreur T.L.P. 980 (WAG,YA); Bayang Mbo Wildlife Sanctuary after Mbu river, 5.35°N, 9.500°E, 25 March 2016, Couvreur T.L.P. 999 (WAG,YA); South Bakundu, 4.49°N, 9.374°E, 19 February 1946, Dundas J. 13989 (K); Entre Babong et Okurikang 35 km WSW Mamfé, 5.58°N, 9.05°E, 29 May 1975, Letouzey R. 13673 (P,YA); Bolo forest 5 km west of Kumba-Mamfe road near Konye, 4.64°N, 9.45°E, 25 March 1986, Nemba J. 64 (K,MO,P,WAG,YA); Kumba Distr Mumbo-Southern Bakossi, 4.83°N, 9.333°E, 09 May 1951, Olorunfemi J. 30561 (K); S Bakundu FR between Bombe Rest House and Mbalange, 4.46°N, 9.452°E, 19 March 1953, Onochie C.F.A. 30860 (K); Korup National Park, 5.26°N, 9.183°E, 24 March 1984, Thomas D.W. 3322 (K,P,YA); Takamanda Forest Reserve, 6.23°N, 9.316°E, 21 March 1985, Thomas D.W. 4549 (YA); 31 km West of Kumba on Mbonge road, 4.51°N, 9.366°E, 26 March 1986, Thomas D.W. 5965 (K,MO,P,WAG,YA); Lake Barombi Kumba, 4.65°N, 9.4°E, 01 April 1986, Thomas D.W. 6090 (P,YA); Korup National Park, 5.27°N, 9.1°E, 01 April 1988, Thomas D.W. 7499 (P)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 387-389, DOI: 10.3897/phytokeys.207.61432, {"references":["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019a. Annickia affinis. The IUCN Red List of Threatened Species: e.T132512369A132513599. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132512369A132513599.en","Meinke, S, 2008. Studies on the morphology and pollination biology of selected West African Annonaceae. M.Sc. University of Rostock."]}

Xylopia cupularis Mildbr., Notizbl. Bot. Gart. Berlin-Dahlem 8: 56, 1921 Fig. 143; Map 17F = Xylopia gilviflora Exell, J. Bot. 73 (Suppl. 1): 4, 1935. Type. Angola. Cabinda, Buco Zau, Mayumbe, Gossweiler J. 6933, 15 Jan 1917: holotype: BM; isotypes: B[100153140]; COI[00004882]; LISC[LISC000308, LISC000309, LISC000310, LISC000311, LISC000312, LISC000313, LISC000314, LISC000315, LISC000316]. = Xylopia chrysophylla Louis ex Boutique, Bull. Jard. Bot. État 21: 108, 1951. Type. Democratic Republic of the Congo. Tshopo, Yangambi, Louis J. 4309, Jun 1937: holotype: BR[BR0000024941518]; isotypes: BR[0000008824752]; MO[1639095, 3007016]; NY[00066781]; US[2091336]. Type. Cameroon. East Region; Deng-Deng, Mildbraed G.W.J. 8649, Mar 1914: holotype B[B 10 0153141]; isotype: BM[fragment]. Description. Tree, up to 35 m tall, d.b.h. up to 50 cm; buttresses present, small. Old branches glabrous, young branches glabrous to pubescent, with fine appressed hairs 0.1-0.3 mm long. Leaves: petiole 2-5 mm long, ca. 1 mm wide, sparsely pubescent, slightly grooved, blade inserted on the side of the petiole; blade 4.6-7.8 cm long, 1.3-2.4 cm wide, lanceolate to elliptic or elliptic-oblong, apex acuminate, acumen 0.6-1.1 cm long, base cuneate to broadly cuneate, usually asymmetrical, papyraceous, below sparsely to densely golden-sericeous (appressed) when young, sparsely pubescent to densely pubescent when old, above glabrous when young and old, concolorous; midrib slightly raised, above glabrous to sparsely pubescent when young, glabrous when old, below pubescent when young and old; secondary veins 10 to 15 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, axillary, peduncle rarely present, up to ca. 4 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 3 per inflorescence; pedicel 5-12 mm long, ca. 1 mm in diameter, sparsely pubescent; in fruit 6-15 mm long, 3-10 mm in diameter, glabrous; bracts 2, towards the middle of pedicel, ca. 2 mm long, ca. 2 mm wide; sepals 3, valvate, 1/2-3/4 fused, forming a cup, 2-3 mm long, 2-3 mm wide, broadly ovate, apex acute to obtuse, base truncate, pubescent outside, glabrous inside; petals free, subequal; outer petals 3, 15.5-36 mm long, 2.2-3.4 mm wide at base, linear to linear-lanceolate, apex acute, base broad and concave, yellow to cream, sericeous outside, pubescent inside; inner petals 3, valvate, 13.5-17.7 mm long, 2.4-3.5 mm wide at base, linear, apex acute, base broad and concave, yellow to cream, pubescent with glabrous base on both surfaces; stamens 160 to 200, in 5 to 6 rows, 1-2 mm long, oblong; connective apex shield-like, glabrous; carpels 12 to 20, ovary ca. 1 mm long, 3.5-3.8 mm long, stigmas connivent, filiform, 2.5-2.8 mm long, pubescent. Monocarps stipitate, stipe 5-24 mm long, 2-5 mm in diameter; monocarps 11 to 18, 23-54 mm long, 14-19 mm wide, obovoid to oblongoid, apex rounded, glabrous, verrucose and wrinkled when dried, reddish green outside, endocarp pink to dark red; seeds 6 to 8 per monocarp, in two rows, 10-13 mm long, 6-10 mm wide, ellipsoid; sarcotesta glaucous blue or gray; aril absent. Distribution. A widespread species across Central Africa, from southeastern Nigeria to northeastern Democratic Republic of the Congo and south to Angola; in Cameroon known from the East, South, Littoral and South-West regions. Habitat. An uncommon species in lowland rain forest, semi-deciduous forest, forest-savanna edges, and secondary forest. Altitude 50-800 m a.s.l. Local and common names known in Cameroon. odjobi (Yaoundé, Mbarga 1940). IUCN conservation status. Least Concern (LC) (Harvey-Brown 2019i). Uses in Cameroon. None reported. Notes. Xylopia cupularis is distinctive among African Xylopia species in its combination of small acuminate leaves, often asymmetrical at the base, with golden appressed pubescence below, relatively long pedicels, sepals fused into a cup-shaped calyx, and the numerous monocarps, which are usually distinctly stipitate. It is often a large tree, and thus may be infrequently collected. Specimens examined. East Region: IK 30 Road Mintom 1 (70 km E de Djoum)- Alati (100 km SE de Djoum), 2.83°N, 13.35°E, 08 January 1973, Letouzey R. 11801 (P,WAG); 21 km ENE of Moloundou-Nguilili Chantier, 2.05°N, 15.17°E, 10 March 1975, Mbenkum T.F. 310 (P,YA); Deng Deng, 5.2°N, 13.52°E, 01 March 1914, Mildbraed G.W.J. 8649 (B). Littoral Region: 6 km NE of Dibombe a village on km 11 of Loum-Yabassi road, 4.68°N, 9.816°E, 26 May 1972, Leeuwenberg A.J.M. 9915 (WAG,YA); Douala (route Razel), 4.02°N, 9.71°E, Mbarga A. 58 (P,YA). South Region: 30 km east from Lélé village, 2.27°N, 13.29°E, 09 September 2013, Couvreur T.L.P. 485 (WAG,YA). South-West Region: Likomba-Pflanzung 15-35 km NE von Victoria [Limbe], 4.09°N, 9.33°E, 01 November 1928, Mildbraed G.W.J. 10629 (A,K); Mount Mabeta peninsula Mabeta, 3.98°N, 9.233°E, 19 October 1997, Tchouto Mbatchou G.P. 1756 (MO)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 454-457, DOI: 10.3897/phytokeys.207.61432, {"references":["Harvey-Brown, Y, 2019i. Xylopia cupularis. The IUCN Red List of Threatened Species: e.T137022000A149069158. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T137092047A137112194.en"]}

Isolona congolana (De Wild. & T. Durand) Engl. & Diels, Monogr. Afrik. Pflanzen.-Fam. 6: 84, 1901 Figs 33, 34; Map 5A ≡ Monodora congolana De Wild. & T. Durand, Bull. Soc. Roy. Bot. Belgique 38: 13, 1899. = Isolona maitlandii Keay, Kew Bull. 7(2): 155, 1952. Type. Cameroon. North-West Province, Ngong, Maitland T.D. 1555, Jun 1931: holotype: K[K000105576]; isotypes: BM, FHO. Type. Democratic Republic of the Congo. Equateur; Lukandu, Dewèvre A.P. 1103, 19 Nov 1896: lectotype, sheet here designated: BR[BR0000006248932]; isotypes: BR[BR0000006248857, BR0000006249588, BR0000006249250]. Description. Tree, 10-30 m tall, d.b.h. 5-45 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches densely pubescent. Leaves: petiole 4-7 mm long, 2-3 mm in diameter, densely pubescent, grooved, blade inserted on top of the petiole; blade 13-19 cm long, 4-5 cm wide, narrowly ovate to narrowly elliptic or oblong, apex acuminate, acumen 0.5-1 cm long, base cuneate to rounded, subcoriaceous, below sparsely pubescent when young, glabrous when old, above sparsely pubescent when young, glabrous when old, concolorous; midrib raised, above sparsely pubescent when young, glabrous when old, below sparsely pubescent when young, glabrous when old; secondary veins 11 to 14 pairs, sparsely pubescent to glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old leafless or young foliate branches, axillary. Flowers with 9 perianth parts in 2 whorls, 1 to 3 per inflorescence; pedicel 10-23 mm long, 1 mm in diameter, sparsely pubescent to glabrous; in fruit 2-5 mm long, 2-3 mm in diameter, glabrous; bracts 3 to 4, several basal and one upper towards the lower half of pedicel, basal bracts 1 mm long, 1 mm wide; upper bracts 1 mm long, 1 mm wide; sepals 3, valvate, free, 3 mm long, 2 mm wide, ovate, apex acute, base truncate, green, pubescent outside, glabrous inside, margins flat; petals basally fused, tube 4-10 mm long, inner and outer whorl not differentiated, equal; lobes 9-20 mm long, 3-7 mm wide, elliptic to ovate, apex rounded, green turning red, margins wavy, glabrous outside, densely pubescent inside, spreading horizontally; stamens numerous, in 3 to 4 rows, 2 mm long, broad; connective discoid, densely pubescent, cream; staminodes absent; carpels fused into a single structure, 2 mm long, stigma bilobed, slightly capitate, densely pubescent. Fruit syncarpous, sessile, 60-80 mm long, 40-50 mm in diameter, ellipsoid, apex rounded, glabrous, smooth to verrucose, irregularly ribbed, green when ripe; seeds not counted, 15-25 mm long, 10-15 mm in diameter, ellipsoid; aril absent. Distribution. A central African species, with a disjunct distribution between the Cameroon Volcanic Line in Cameroon, and Eastern Democratic Republic of Congo, one collection from Central African Republic; in Cameroon known from the Littoral, North-West and South-West regions. Habitat. A common species when present, mainly in montane or premontane rain forests, along rivers and bush land. Altitude 800-1700 m a.s.l. Local and common names known in Cameroon. Ndin (Westphal 10012). IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019q). Uses in Cameroon. food: fruit for condiments, spices, flavourings (Westphal 10012). Notes. This the only species of Isolona growing above 1000 m in Cameroon. Isolona congolana is characterized by the densely pubescent inner part of the corolla tube and a glabrous outer part of the tube, a unique feature in this genus (I. pilosa is pubescent on both sides of the corolla). The leaves are also characteristic being narrowly ovate to narrowly elliptic or oblong, giving a unique aspect to the foliage. Specimens examined. Littoral Region: Manengouba Mt 4 km WNW Of Nkongsamba, 4.98°N, 9.900°E, 04 April 1972, Leeuwenberg A.J.M. 9550 (B,BR,C,GC,H,K,LD,M,MO,P,WAG,YA). North-West Region: Kagwene, 6.12°N, 9.734°E, 20 May 2009, Ashworth J. 196 (K,YA); Bamenda Distr Ngong, 6.58°N, 10.43°E, 01 June 1931, Maitland T.D. 1555 (BM,K); Bamenda Wae, 6°N, 10.41°E, 01 April 1931, Maitland T.D. 1596 (K). South-West Region: Nyasoso, 4.86°N, 9.7°E, 04 June 1996, Cable S. 2843 (K,MO,WAG,YA); 2 km north of Nyasoso towards Mpako, 4.84°N, 9.679°E, 04 April 2016, Couvreur T.L.P. 1054 (WAG,YA); Nyasoso, 4.83°N, 9.683°E, 19 March 1996, Etuge M. 1794 (K,WAG); White trail (above Kupe village) towards Madam 4.78°N, 9.716°E, 28 May 1996, Etuge M. 2000 (BR,K,MO,P,WAG,YA); Lake Edip, 4.95°N, 9.65°E, 21 November 1998, Etuge M. 4488 (K,WAG,YA); Etube Tape from Nyasoso, 4.83°N, 9.683°E, 06 February 1995, Lane P. 532 (K,YA); Bu 4.15°N, 9.233°E, 6 June 1898, Lehmbach H. 224 (B). West Region: Bali Ngemba Forest Reserve, 5.82°N, 10.08°E, 13 April 2004, Etuge M. 5431 (K,WAG,YA); Along the road 6 km W of Dschang on road to Fongo Ndeng, 5.45°N, 9.95°E, 15 May 1978, Westphal E. 10012 (P,WAG)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 133-136, DOI: 10.3897/phytokeys.207.61432, {"references":["Couvreur, TLP, 2009. Monograph of the syncarpous African genera Isolona and Monodora (Annonaceae). Systematic Botany Monographs 87: 1 - 150","Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019q. Isolona congolana. The IUCN Red List of Threatened Species: e.T32736A132677351. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T32736A132677351.en"]}

Monanthotaxis couvreurii P.H.Hoekstra, PhytoKeys 69: 79, 2016 Fig. 51; Map 6I Type. Cameroon. Central Region; Ottotomo Forest Reserve, Couvreur T.L.P. 762, 24 Apr 2015: holotype: WAG[WAG.1576998, WAG.1576999, WAG.1577000]; isotypes: MPU[MPU1374962]; YA n.v. Description. Liana, up to 20 m tall, d.b.h. up to 4 cm. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches densely pubescent with dense ascending reddish brown hairs 0.1-0.2 mm long. Leaves: petiole 3-5 mm long, ca. 1 mm in diameter, densely pubescent, slightly grooved, blade inserted on top of the petiole; blade 4.5-12 cm long, 1.5-4.5 cm wide, oblong to obovate, apex acuminate to acute, acumen ca. 1 cm long, base cuneate to rounded, papyraceous, below sparsely pubescent when young and old, above sparsely pubescent when young, glabrous when old, discolorous, whitish below; midrib sunken or flat, above glabrous when young and old, below pubescent when young and old; secondary veins 7 to 11 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences cauliflorous or more rarely ramiflorous on old leafless branches, axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 2(3) per inflorescence when on branches, up to 20 per inflorescence when on main trunk; pedicel 4-20 mm long, ca. 1 mm in diameter, sparsely pubescent; in fruit unknown; basal bract not seen, upper bract minute, ca. 0.5 mm, ca. 1 mm wide; sepals 3, valvate, basally fused, ca. 1 mm long, 1 mm wide, triangular, apex acute, base truncate, brown, densely pubescent outside, glabrous inside, margins flat; petals free, subequal, inner petals partly covered in bud; outer petals 3, 3.5-5 mm long, 2-3.5 mm wide, elliptic to ovate, apex obtuse, base truncate, light yellow to white, margins flat, densely pubescent outside, sparsely pubescent inside; inner petals 3, valvate, 3-4.5 mm long, 1.2-1.5 mm wide, elliptic to ovate, apex acute, base truncate, light yellow to white, margins flat, pubescent outside, glabrous inside; stamens 13 to 15, in 1 row, basally fused between each them, ca. 1 mm long, linear; connective truncate to rounded, pubescent, cream; staminodes absent; carpels free, 9 to 12, ovary ca. 1 mm long, stigma globose, glabrous. Fruits unknown. Distribution. endemic to Cameroon; known from the Central Region. Habitat. A rare species, in lowland old secondary rain forests. Attitude around 700 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Critically Endangered (CR) (Hoekstra et al. 2021). Uses in Cameroon. None recorded. Notes. Monanthotaxis couvreurii is distinguished by its mainly cauliflorous flowers (but may also be ramiflorous) and its stamens in one row that are basally fused, a unique feature in Monanthotaxis (Hoekstra et al. 2016). This species is only known from the Ottotomo Forest reserve, near Yaoundé. Specimens examined. Central Region: Ottotomo Forest Reserve 45 km South of Yaoundé ca 5 km on main path into reserve, 3.65°N, 11.28°E, 24 April 2015, Couvreur T.L.P. 762 (WAG,YA); Reserve Forestière d’Ottotomo 40 km de Yaoundé sur la route de Kribi, 3.64°N, 11.27°E, 05 May 1970, Farron C. 7266 (P); Reserve forestière d’Ottotomo Yaoundé à environ 40 km au SW sur la route de Makak, 3.64°N, 11.27°E, 26 May 1970, Farron C. 7359 (YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 182-184, DOI: 10.3897/phytokeys.207.61432, {"references":["Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01","Hoekstra, PH, Wieringa, JJ, Chatrou, LW, 2016. A nonet of novel species of Monanthotaxis (Annonaceae) from around Africa. PhytoKeys 69: 71 - 103, DOI: https://doi.org/10.3897/phytokeys.69.9292"]}

Afroguatteria Boutique, Bull. Jard. Bot. État Bruxelles 21: 104, 1951 Type species. Afroguatteria bequaertii (De Wild.) Boutique. Description. Same as species. A genus of lianas with three species from Central Africa, in the Democratic Republic of the Congo, Cameroon and Angola (Cabinda); one species in Cameroon, endemic. This genus was phylogenetically validated (Guo et al. 2017b). Taxonomy. no revision has yet been published, but see Boutique (1951b) and Paiva (1966)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on page 26, DOI: 10.3897/phytokeys.207.61432, {"references":["Guo, X, Hoekstra, PH, Tang, CC, Thomas, DC, Wieringa, JJ, Chatrou, LW, Saunders, RM, 2017b. Cutting up the climbers: Evidence for extensive polyphyly in Friesodielsia (Annonaceae) necessitates generic realignment across the tribe Uvarieae. Taxon 66: 3 - 19, DOI: https://doi.org/10.12705/661.1","Boutique, R, 1951b. Fam. 35. Annonaceae. In: Boutique R (Ed.) Flore du Congo-Belge et du Ruanda-Urundi. I.N.E.A.C., Brussels. https://doi.org/10.2307/3666813","Paiva, JAR, 1966. Revisao das Annonaceae de Angola. Memorias Sociedade Broteriana 19: 5 - 128"]}

Annickia polycarpa (DC.) Setten & Maas ex I.M. Turner, Phytotaxa 32: 52, 2011 Fig. 5; Map 1E ≡ Unona polycarpa DC., Syst. Nat. 1: 499, 1817; Coelocline Unona polycarpa (DC.) A.DC., Mém. Anon.: 33, 1832; Melodorum polycarpum (DC.) Benth., Trans. Linn. Soc. London 23: 477-478, 1862; Xylopia? Xylopia polycarpa (DC.) Oliv., Fl. Trop. Afr. 1: 32, 1868. Type. Sierra Leone. no region; no locality, Afzelius A. s.n., no date: holotype: B[B 10 0068937]; isotype: BM[BM000547035]. Description. Tree, 2-20 m tall, d.b.h. unknown; stilt roots or buttresses absent, slash yellow. Indumentum of simple, bifid, fasciculate or star hairs; old leafless branches glabrous, young foliate branches densely pubescent to tomentose. Leaves: petiole 3-8 mm long, 2 mm in diameter, densely pubescent to tomentose, grooved, blade inserted on the side of the petiole; blade 5-27 cm long, 2-8 cm wide, elliptic to obovate, apex acuminate, acumen 1-2 cm long, base cuneate to acuminate, coriaceous, below pubescent when young and old, hairs mainly bifid or stellate but some simple too, pointing in all directions, above pubescent when young and old, concolorous; midrib sunken or flat, above pubescent towards base when young, pubescent towards base when old, below pubescent when young, sparsely pubescent when old; secondary veins 8 to13 pairs, pubescent below; tertiary venation intermediate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, leaf opposed or extra axillary. Flowers with 6 perianth parts in 2 whorls, 1 per inflorescence; pedicel 9-19 mm long, ca. 2 mm in diameter, pubescent; in fruit 20 mm long, 4-5 mm in diameter, pubescent; bracts 2, one basal and one upper towards the middle of pedicel, basal bract 8 mm long, 4 mm wide; sepals 3, valvate, free, 9-22 mm long, 4-5 mm wide, triangular, apex acute, base truncate, pubescent outside, glabrous inside, margins flat; petals free; outer petals absent; inner petals 3, valvate, 23-34 mm long, 8-19 mm wide, elliptic to inversely Y-shaped ridged, apex acute, base broad and concave, claw mm long, yellow, margins wavy, densely pubescent outside, glabrous inside; stamens 90 to 200, in 5 to 6 rows, 3-4 mm long, linear; connective flattened, glabrous; staminodes absent; carpels free, ca. 70, ca. ovary 3 mm long, stigma lobed, sparsely pubescent. Monocarps stipitate, stipes 19-59 mm long, 1-2 mm in diameter, monocarps 5 to 55, 18-23 mm long, 8-12 mm in diameter, obovoid, apex mucronate, sparsely pubescent, smooth, glossy, green turning red to black when ripe; seed 1, ca. 20 mm long, ca. 10 mm in diameter, ellipsoid; aril absent. Distribution. A mainly West African species, from Sierra Leone to Cameroon; in Cameroon known from the South region. Habitat. A rare species in Cameroon, in lowland and pre-montane rain forests mainly in primary habitats. Altitude 110-1400 m a.s.l. Local and common names known in Cameroon. Pola (Mvaï, Fang, Annet 174); African yellow wood, yellow wood (english); Moambe jaune (french). IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019d). Uses in Cameroon. medicine: bark as an antisepctic, against fever, malaria; construction: house building, furniture; dyes and tannins: as a yellow dye. Notes. Annickia polycarpa is distinguished by the densely pubescent to tomentose upper side of the midrib and the petioles, and generally long stipes. Specimens examined. South Region: Bipindi, 3.26°N, 10.20°E, 09 June 1928, Annet E. 174 (P).

Monodora Dunal, Monogr. Anon. 3: 79, 1817 Type species. Monodora myristica (Gaertner) Dunal. Description. Trees, rarely shrubs or rarely lianas, 4-40 m tall, d.b.h. 6-100 cm; stilt roots or buttresses absent. Indumentum of simple hairs, or absent. Leaves: petiole 2-14 mm long, 1-2 mm in diameter, blade inserted on the side of the petiole; blade 4-50 cm long, 2-15 cm wide, elliptic or obovate or oblong or ovate, apex acuminate, acumen ca. 1 cm long; base cuneate to rounded, concolorous; midrib raised above; secondary veins 8 to 23 pairs; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, leaf opposed or extra axillary, 1 per inflorescence; pedicel 8-270 mm long, 1-2 mm in diameter; in fruit 25-350 mm long, 3-15 mm in diameter; bract 1, towards the upper half or middle of pedicel; sepals 3, valvate, free, 2-40 mm long, 2-17 mm wide, ovate or elliptic, apex acute or attenuate or rounded, base truncate, margins flat, undulate, wavy or crisped; petals basally fused, tube 2-8 mm long, inner and outer whorl differentiated, outer petals longer than inner; outer petals 3, 17-105 mm long, 6-40 mm wide, oblong or obovate or ovate, apex truncate, base truncate or with two small lobes, margins flat or wavy or crisped; inner petals 3, valvate, 9-35 mm long, 5-30 mm wide, cordate or rhombic or triangular to cochleate, apex acuminate to acute, base narrowed into a claw, claw 1-9 mm long; receptacle flat to strongly convex; stamens numerous, in 9 to 20 rows, 1-2 mm long, broad; connective discoid or elongated; staminodes absent; carpels fused into a syncarpous ovary, 1-5 mm long, stigma bilobed, slightly capitate. Fruit syncarpous, sessile, 35-150 mm long, 20-150 mm in diameter, globose or ovoid or conical, apex apiculate to rounded; seeds numerous, 9-22 mm long, 5-13 mm in diameter, ellipsoid or flattened ellipsoid; aril absent. A genus of trees with 14 known species, from West, Central and East Africa. In Cameroon six species are known, one endemic. Monodora, together with its sister genus Isolona, are unique in Annonaceae in having truly syncarpous ovaries, producing single fruits with unordered seeds, in contrast to other genera which have either uni- or biseriate placentation. Petals in Monodora are basally fused forming a short (not clearly visible) tube. The petals, however, are differentiated into inner and outer whorls, in contrast to Isolona (which has six equal lobes in a single whorl with a visible tube). In the vegetative state, Monodora and Isolona (together with Polyceratocarpous pellegrinii) are characterized by a raised leaf midrib on the upper side, in contrast to a sunken or flat midrib in all other genera found in Cameroon. Monodora species tend to have a whitish-grey wax indumentum on young leaves and fruits, which is especially noticeable in the common and widespread species M. myristica. Taxonomy. Couvreur (2009)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 246-247, DOI: 10.3897/phytokeys.207.61432, {"references":["Couvreur, TLP, 2009. Monograph of the syncarpous African genera Isolona and Monodora (Annonaceae). Systematic Botany Monographs 87: 1 - 150"]}

Afroguatteria discostigma (Diels) X.Guo & R.M.K.Saunders, Taxon 66 (1): 13, 2017 Fig. 4; Map 1A Cleistopholis discostigma ≡ Cleistopholis discostigma Diels, Bot. Jahrb. Syst. 39: 474, 1907; Oxymitra discostigma (Diels) Ghesq. ex Pellegr., Bull. Soc. Bot. France, 66, 1949; Richella discostigma (Diels) R.E.Fr., in Engler & Prantl Nat. Pflanzenfam., ed. 2, 17a (2): 139, 1959; Friesodielsia discostigma (Diels) Steenis, Blumea 12: 359, 1964. Type. Cameroon. South Region; Bipindi, Zenker G.A. 2980, Apr 1904: holotype: B[B10 0153055]; isotypes: BM[BM001125042]; BR [BR000008800398]; [BR000008800398]; G[G00308361]; GOET[GOET005676]; HBG[HBG-502538]; K[K000198949]; L[L.1754813]; M[M-0107910]; P[P00363341]; S[S03-2239]; WAG[WAG0053550]. Description. Liana, height unknown, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent with short sericeous hairs. Leaves: petiole 3-4 mm long, 1-2 mm in diameter, sparsely pubescent to glabrous, grooved, blade inserted on the side of the petiole, 7.5-10 cm long, 4-5 cm wide, elliptic, apex acuminate, acumen ca.1 cm long, base obtuse, subcoriaceous, below sparsely pubescent to glabrous when young, glabrous when old, above glabrous when young and old, discolorous, whitish below (both when fresh and dry); midrib flat or sunken, above glabrous when young and old, below sparsely pubescent when young, glabrous when old; secondary veins 8 to 13 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences cauliflorous or ramiflorous on young foliate branches, leaf-opposed or extra-axillary. Flowers with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 18-22 mm long, ca. 1 mm in diameter, pubescent; in fruit 20-40 mm long, 2-3 mm in diameter, pubescent; bracts not seen; sepals 3, valvate, free, 1-2 mm long, 1-2 mm wide, triangular, apex acute, base truncate, pubescent outside, glabrous inside, margins flat; petals free, subequal; outer petals 3, valvate, 5-6 mm long, 3-4 mm wide, ovate, apex acute, base narrowed, margins flat, pubescent outside, pubescent inside; inner petals 3, valvate, 3-3.5 mm long, 2-3 mm wide, elliptic, apex obtuse, base truncate, margins flat, pubescent outside, pubescent inside; number of stamens not counted, number of rows not seen, 2-3 mm long, oblong; anthers not septate; connective discoid, pubescence not seen; staminodes absent; carpels not seen but free. Monocarps stipitate, stipes 5-10 mm long, 1-2 mm in diameter; monocarps 3 to 7, 10-15 mm long, 5-8 mm in diameter, ellipsoid, apex apiculate, pubescent, smooth, not ribbed, color unknown; seed 1, 13-15 mm long, 5-7 mm in diameter, ellipsoid; aril absent. Distribution. endemic to Cameroon; known from the South Region. Habitat. A rare species, in primary lowland rain forests. Altitude 100-200(?) m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. NE (Not Evaluated), but probably CR. Uses in Cameroon. None recorded. Notes. Afroguatteria discostigma is only known from four collections by Zenker, all collected close to the type locality in Bipindi (South Region). It remains incompletely known and measurements here are incomplete. The species can be distinguished by its almost glabrous vegetative parts (young foliate branches and underside of young leaves can be pubescent with short hairs), its small leaves that are glaucous below (both when fresh and dry) and branches drying black. The flowers are borne on terminal pedicels that appear leaf-opposed or extra-axillary, but can also be cauliflorous (Zenker 3023), the carpels have a single ovule and thus monocarps are single-seeded like in Afroguatteria bequaertii (De Wild.) Boutique) (Boutique 1951a). The altitude range given here is the one around Bipindi, but could be higher given that the mountain range Ngovayang (up to 1000 m) is very close. A recent molecular phylogenetic study showed that this species (under the name Friesodielsia discostigma) clustered in the genus Afroguatteria being sister to the Congolese species A. bequaertii (Guo et al. 2017b). It is thus quite different genetically from the the African species of Friesodielsia (now Monanthotaxis) in which it was placed before based on morphology (van Steenis 1964). Specimens examined. South Region: Bipindi, 3.05°N, 10.25°E, 01 January 1905, Zenker G.A. 2102a (BM,BR,E,G,K,P); Bipindi, 3.05°N, 10.25°E, 01 January 1904, Zenker G.A. 3023 (BM,G,K,L,P,WAG); Bipindi, 3.08°N, 10.41°E, 01 March 1914, Zenker G.A. 576 (MA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 26-29, DOI: 10.3897/phytokeys.207.61432, {"references":["Boutique, R, 1951a. Annonacees nouvelles de la flore du Congo belge et du Ruanda-Urundi. Bulletin du Jardin Botanique de l'Etat, Bruxelles 21: 94 - 126, DOI: https://doi.org/10.2307/3666813","Guo, X, Hoekstra, PH, Tang, CC, Thomas, DC, Wieringa, JJ, Chatrou, LW, Saunders, RM, 2017b. Cutting up the climbers: Evidence for extensive polyphyly in Friesodielsia (Annonaceae) necessitates generic realignment across the tribe Uvarieae. Taxon 66: 3 - 19, DOI: https://doi.org/10.12705/661.1","van Steenis, CGGJ, 1964. An account of the genera Richella A. Gray and Oxymitra (Bl.) Hook. f. & Th. (Annonaceae). Blumea-Biodiversity, Evolution and Biogeography of Plants 12: 353 - 361"]}

Uvariopsis submontana Kenfack, Gosline & Gereau, Novon 13(4): 444, 2003 Figs 138, 139; Map 16I Type. Cameroon. South-West Region; Rumpi Hills, Kenfack D. 1334, 6 Feb 2000: holotype: YA; isotypes: K[000683145]; MO; SCA. Description. Tree, 8-25 m tall, d.b.h. up to 30 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches glabrous to pubescent. Leaves: petiole 3-8 mm long, 3-5 mm in diameter, glabrous to sparsely pubescent, grooved, blade inserted on top of the petiole; blade 16-38 cm long, 5-11 cm wide, oblong to obovate, apex attenuate to acuminate, acumen 2-3 cm long, base rounded to subcordate, papyraceous to subcoriaceous, below glabrous when young and old, above glabrous when young and old; midrib sunken or flat, above glabrous when young and old, below sparsely pubescent when young, glabrous when old; secondary veins 9 to 18 pairs per side, glabrous above; tertiary venation reticulate. Individuals unisexual, monoecious; inflorescences cauliflorous, with hundreds (up to 500) of flowers packed at the base and then more sparsely distributed up to 6 m. Flowers unisexual, monoecious, with 6 perianth parts in 2 whorls, conical to pyramidal in bud, 6 to 50 per inflorescence, male and female inflorescences dimorphic; male pedicel: 25-50 mm, ca. 1 mm in diameter, pubescent; female pedicel: 30-60 mm long, ca. 1 mm in diameter, pubescent; in fruit 25-90 mm long, 3-7 mm in diameter, glabrous; bracts 2 to 4, all basal, ca. 1 mm long, ca. 1 mm wide; male sepals 2, connate, splitting at maturity, 5-10 mm long, 6-12 mm wide, triangular, apex acute, base truncate, brown-red, pubescent outside, glabrous inside, margins flat; female sepals 2, connate, splitting at maturity, 6-8 mm long, 6-9 mm wide, broadly ovate, apex acute, base truncate, brown-red, pubescent outside, glabrous inside, margins flat; male petals, 4, basally fused, tube 4-9 mm long, 8-18 mm long, 5-8 mm wide, elliptic to narrowly elliptic, apex acute, base truncate, wine red, margins flat, tomentose outside, pubescent inside; female petals, 4, basally fused, tube 3-4 mm long, 15-17 mm long, 5-7 mm wide, elliptic to narrowly elliptic, apex acute, base truncate, wine red, margins flat, tomentose outside, pubescent inside; male flowers: stamens 700 to 1000, in 25 to 30 rows, 0.5-1 mm long, oblong; connective reduced or absent, glabrous, cream; staminodes absent; female flowers: carpels free, 60 to 100, ovary 15-24 mm long, stigma globose, pubescent. Monocarps shortly stipitate, stipes ca. 1 mm long, ca. 1 mm in diameter; monocarps 9 to 25, 17-80 mm long, 13-55 mm in diameter, ovoid to oblong, apex apiculate, sparsely pubescent to glabrous, smooth, slightly constricted over seeds in dried material, pale green turning dark yellow at maturity; seeds 6 to 12 per monocarp, 18-25 mm long, 8-13 mm in diameter, ellipsoid; aril absent. Distribution. endemic to Cameroon, known from the South, Littoral and South West regions. Habitat. A species restricted to submontane primary or old secondary rain forests. Altitude: (600) 900-1300 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Endangered (EN) (Cheek 2014d). Uses in Cameroon. None reported. Notes. Uvariopsis submontana is distinguished by the combination of conical flower buds and basally fused 4 petals, and the trunk base completely covered with hunders of flowers. It is very close to U. korupensis, but differs by its smaller leaves, longer sepals, and submontane habitat (U. korupensis being found in the lowlands, generally below 700 m). Specimens examined. Littoral Region: Ebo Wildlife Reserve Djuma permanent camp On east trail, 4.36°N, 10.25°E, 15 February 2013, Couvreur T.L.P. 627 (WAG,YA); Ebo Bekob abandoned village CRES research station, 4.37°N, 10.41°E, 22 April 2005, Etuge M. 6482 (K); Nkam Yingui Bataba, 4.53°N, 10.24°E, 20 February 2002, Kenfack D. 1602 (MO). South Region: Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.49°N, 10.34°E, 12 February 2015, Couvreur T.L.P. 682 (WAG,YA). South-West Region: Nyasoso, 4.81°N, 9.7°E, 08 February 1995, Cable S. 1221 (K,MO,WAG,YA); Kupe village, 4.78°N, 9.716°E, 30 May 1996, Cable S. 2736 (K,WAG,YA); Esense river near farm of Philip Taza, 4.76°N, 9.683°E, 19 January 1995, Cheek M. 7034 (K,WAG,YA); Kupe village, 4.76°N, 9.683°E, 24 January 1995, Cheek M. 7131 (K,WAG); Nyasoso village on max’s trail to Mt 4.82°N, 9.692°E, 05 April 2016, Couvreur T.L.P. 1059 (WAG,YA); Rumpi mountains forest trail ca 5 km after Dikome Balue village ca 40 km north of Kumba, 4.93°N, 9.241°E, 10 January 2016, Couvreur T.L.P. 965 (WAG,YA); Below Kupe rock near Esense river, 4.78°N, 9.683°E, 23 January 1995, Elad M. 69 (K,YA); South of Nyasoso (end of village) Trail at the end of the village left hand side Nyasoso-Mbulle road, 4.81°N, 9.683°E, 03 July 1996, Etuge M. 2562 (K,YA); Rumpi Hills, 4.95°N, 9.033°E, 06 February 2000, Kenfack D. 1334 (K,MO,YA); Forest trail 2 km south from Etube-Tape village, 4.85°N, 9.7°E, 01 February 1995, Lane P. 490 (K,WAG,YA); Nyasoso, 4.82°N, 9.666°E, 23 October 1995, Sebsebe D. 5035 (K,YA); 7 km WNW of Bomana 34 km NW of Limbé, 4.27°N, 9.112°E, 15 December 1984, Villiers J.-F. 2490 (P,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 434-437, DOI: 10.3897/phytokeys.207.61432, {"references":["Kenfack, D, Gosline, G, Gereau, RE, Schatz, GE, 2003. The genus Uvariopsis (Annonaceae) in tropical Africa with a recombination and one new species from Cameroon. Novon 13: 443 - 449, DOI: https://doi.org/10.2307/3393377","Cheek, M, 2014d. Uvariopsis submontana. The IUCN Red List of Threatened Species: e.T45421A3001680. https://doi.org/10.2305/IUCN.UK.2014-3.RLTS.T45421A3001680.en"]}

Uvaria mollis Engl. & Diels, Notizbl. Königl. Bot. Gart. Berlin 2: 295, 1899 Fig. 105; Map 14B ≡ Uva mollis (Engl. & Diels) Kuntze, Kuntze, Deutsche Bot. Monatsschr. 21: 173, 1903. Type. Cameroon. South Region; Bipindi, Zenker G.A. & Staudt A. 3, no date: lectotype, here designated: K[K000198767]. Description. Liana(?), unknown height, d.b.h. unknown. Indumentum of fasciculate hairs; old leafless branches sparsely pubescent to glabrous, young foliate branches tomentose. Leaves: petiole 2-5 mm long, 1-2 mm in diameter, tomentose, slightly grooved, blade inserted on top of the petiole; blade 13-16 cm long, 5-7 cm wide, oblong to elliptic, apex acuminate, acumen 1.5-2 cm long, base subcordate, subcoriaceous, below pubescent with fasciculate hairs when young and old, above glabrous when young and old; midrib sunken or flat, above densely pubescent when young, pubescent when old, below densely pubescent when young or old; secondary veins 14 to 17 pairs, prominent and pubescent above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young branches, leaf-opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 30-40 mm long, ca. 2 mm in diameter, tomentose; bracts 2, one basal and one in the upper half of pedicel, basal bract 1-2 mm long, 1-2 mm wide; upper bract 2-3 mm long, 4-7 mm wide; sepals 3, valvate, free, 4-7 mm long, 5-6 mm wide, ovate, apex acute, base truncate, pubescent outside, inside not seen, margins flat; petals free, inner slightly smaller than outer; outer petals 3, 20-23 mm long, 11-14 mm wide, elliptic, apex rounded, base truncate, margins revolute, pubescent outside, inside not seen; inner petals 3, imbricate, 14-16 mm long, 16-17 mm wide, ovate to suborbicular, apex rounded, base ungulate, claw ca. 5 mm long, margins flat or revolute, pubescent outside, glabrous inside; stamens 300 to 400, in 6 to 7 rows, 1-2 mm long, linear; connective discoid, pubescent; staminodes absent; carpels free, number unknown, ovary ca. 3 mm long, stigma coiled, densely pubescent. Fruits unknown. Distribution. endemic to Cameroon, known from the Central and South regions. Habitat. A rare species; in lowland primary rain forests. Altitude 200-800 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not evaluated. Uses in Cameroon. None reported. Notes. Uvaria mollis is an imperfectly known species. Morphologically, it resembles U. lastoursvillensis Pellegr., a Gabonese endemic (Pellegrin 1949; Le Thomas 1969b) by its leaves with clearly impressed secondary veins looping towards the margin, the overall dense pubescence in the younger branches and flowers, and the single terminal flower at the end of young foliate branches. However, U. mollis is less pubescent with much shorter hairs leading to a very different aspect, and the inner petals are unguiculate with a long claw (ca. 5 mm), suggesting they are different species. In the absence of more material, we follow Le Thomas (1969b) and keep them separate. The name U. mollis was first used for a South Asian species (Uvaria mollis Wall.) given in the "Wallich Catalogue" (Wallich 1832, catalogue number 6475), but this name is a nom. nud. In Flora Indica, Hooker and Thomson (1855 p. 135) considered this name to be a synonym of Unona pannosa Dalzell (Dalzell 1851) (which is now Meiogyne pannosa (Dalzell) J.Sinclair). We found no evidence that the Wallich name was used again (e.g. Turner 2018), rendering the name U. mollis Engl. & Diels as described by Engler and Diels (1899) valid. We chose here the specimen Zenker & Staudt 3 (K) as the lectotype. It was a hard decision, because according to JSTOR the only two specimens of the syntypes that remain are in NY (Zenker 475) and K (Zenker & Staudt 3). Neither of these specimens have flowers or fruits, and are thus poor specimens to choose as a lectotype. However, we know that the specimens deposited in B did have flowers, as this was indicated by Engler and Diels (1901, p. 29). It is probable that they got destroyed or have just not been identified as type material. However, we had access to Annick Le Thomas’s archives in P when she was preparing the "Flore du Cameroun" (but never finalized it). In those archives there is an illustration of U. mollis with a flower (see Fig. 105) which was drawn from Zenker & Staudt 3. This indicates that Le Thomas had access to a specimen of Zenker & Staudt 3 with flowers, suggesting that a better specimen might be available and could be located (possibly in P or B). At this point we have no proof that another specimen of Zenker 475 is available. Specimens examined. Central Region: Yaoundé, 3.87°N, 11.52°E, 1890, Zenker G.A. 249 (B); Yaoundé, 3.87°N, 11.52°E, Zenker G.A. 3 (K); Yaoundé, 3.06°N, 10.38°E, 01 January 1913, Zenker G.A. 475 (NY). East Region: Bitya near R Ja Nsolo, 3.02°N, 12.37°E, 31 March 1921, Bates G.L. 1818 (K).

Duguetia dilabens Chatrou & Repetur, Changing Genera: 69, 1998 Map 4A Type. Gabon. Ngounié; new road from Mouila to Yeno, 5 km on either side of Kembele village, Thomas D.W. & Wilks C.M. 6510, 20 Jul 1986: lectotype, sheet here designated: WAG[WAG0143388]; isotypes: MO[MO-357359]; P[P00389133]; WAG[WAG0027128]. Description. Tree, up to 30 m tall, d.b.h. unknown; stilt roots or buttresses absent. Indumentum of stellate or fasciculate hairs; old leafless branches sparsely pubescent to glabrous, young foliate branches sparsely pubescent. Leaves: petiole 4-5 mm long, 2-3 mm in diameter, sparsely pubescent, grooved, blade inserted on the side of the petiole; blade 7-16 cm long, 2.5-6 cm wide, narrowly elliptic to narrowly obovate, apex acuminate to acute, acumen ca. 1 cm long, base acute, subcoriaceous, below sparsely pubescent when young and old, above glabrous when young and old, concolorous; midrib sunken or flat, above glabrous when young and old, below sparsely pubescent when young and old; secondary veins 8 to 15 pairs, distinct, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, leaf opposed, not forming a peduncle. Flowers with 9 perianth parts in 3 whorls, 2 to 4 per inflorescence; pedicel 10-12 mm long, 1-2 mm in diameter, sparsely pubescent to densely pubescent; in fruit 10-50 mm long, 1-15 mm in diameter, sparsely pubescent to densely pubescent; bracts 2, one basal and one towards the lower half of pedicel, basal bracts 5-9 mm long, 7-9 mm wide; sepals 3, valvate, free, 12-15 mm long, 6-9 mm wide, elliptic to ovate, apex acute, base truncate, greyish green, pubescent outside, pubescent inside, margins flat; petals free, outer petals longer than inner to sub equal; outer petals 3, 12-15 mm long, 4-6 mm wide, ovate, apex acute, base truncate, white, margins flat, sparsely pubescent outside, glabrous inside; inner petals 3, imbricate, 13-15 mm long, 4-5 mm wide, elliptic, apex acute, base truncate, margins flat, pubescent outside, glabrous inside; stamens numerous, 1 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, ca. 75, 2-3.5 mm long, stigma globose, glabrous. Fruit pseudosyncarpous, size and shape unknown; carpels sessile, free to basally fused, unknown number of carpels, 20-35 mm long, ovary 10-30 mm in diameter, obovoid to deltoid, apex apiculate, pubescent, densely pubescent, longitudinally ribbed with 6 to 7 main ribs, color unknown; seed 1 per monocarp, 12-20 mm long, 10-13 mm in diameter, ellipsoid; aril present, color unknown. Distribution. Known from Gabon and Cameroon; in Cameroon known from South and Littoral regions. Habitat. A rare species known from four specimens; in lowland periodically inundated or non-inundated rain forests. Altitude 0-500 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Endangered (EN) (Texier and Stévart 2020) Uses in Cameroon. None recorded. Notes. Duguetia dilabens is distinguished by its leaves that are narrowly elliptic to narrowly obovate, the midrib not grooved above and the carpels only basally fused in fruit. It was recently collected in Campo Ma’an National Park (Couvreur 692), but the sample is sterile and the identification remains doubtful, although the leaves do match the type specimen. Couvreur 692 also notes that the trunk had a bark peeling in smallish flakes. Specimens examined. South Region: Reserve forestière de la Kienké (Kribi-Ebolowa km 16), 3.1°N, 10.25°E, 05 January 1968, Bamps P.R.J. 1679 (BR, YA); Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.49°N, 10.34°E, 12 February 2015, Couvreur T.L.P. 692 (WAG,YA).

Uvariodendron connivens (Benth.) R.E.Fr., Acta Horti Berg. 10: 55, 1930 Figs 120, 121; Map 15D ≡ Uvaria connivens Benth., Trans. Linn. Soc. London 23(3): 465, 1862. = Uvaria megalantha Diels, Bot. Jahrb. Syst. 39: 472, 1907. Type. Cameroon. South Region, Bipindi, Zenker G.A. 3204, 1904: lectotype, here designated: WAG[WAG0057972]; isolectotypes: BM[BM000636652]; GEOT[GOET005733]; K[K000198800]; M[M0107939]; P[P01982908]; S[S07-13392]. Type. Equatorial Guinea. Bioko Norte; Bioko (Fernando Po), Mann G. 1159, 1861: lectotype, here designated: K[K000198803]; isolectotypes: K[K000198804, K000198805]; P[P00362655]. Description. Tree, 3-20 m tall, d.b.h. 2-25 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches glabrous. Leaves: petiole 4.5-21 mm long, 2-6 mm in diameter, glabrous, grooved, blade inserted on top of the petiole; blade 25.4-63.6 cm long, 7-17.7 cm wide, narrowly elliptic to narrowly oblong, apex acuminate, acumen 0.7-2.4 cm long, base rounded (sometimes acute, truncate or subcordate), subcoriaceous, below glabrous when young and old, above glabrous when young and old; midrib sunken or flat, above glabrous when young and old, below glabrous when young and old; secondary veins 15 to 29 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences cauliflorous or ramiflorous on old or young foliate branches, axillary. Flowers with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 5-40 mm long, 1.4-4 mm in diameter, glabrous to pubescent; in fruit 13-31 mm long, 3-8 mm in diameter, glabrous; bracts 2 to 5, several basal and one upper towards the upper half of pedicel, basal bracts 2-3 mm long, 1-3 mm wide; upper bract 4-13 mm long, 6-14 mm wide; sepals 3, basally fused, valvate or slightly imbricate, 5-14 mm long, 7-17 mm wide, ovate, apex acuminate, base truncate, green, glabrous outside, pubescent and glabrous towards center inside, margins flat; petals free, sub equal; outer petals 3, 11-32 mm long, 4-26 mm wide, ovate, apex acuminate, base truncate, purple to wine red, margins flat, glabrous outside, glabrous or pubescent towards the margins inside; inner petals 3, valvate, 9.5-30 mm long, 8-20 mm wide, ovate, apex acuminate, base truncate, purple to wine red, margins flat, glabrous outside, glabrous to pubescent with glabrous base inside; stamens 1908 to 2456, in 15 to 25 rows, 2-5 mm long, linear; connective discoid, glabrous, cream; staminodes absent; carpels free, 6 to 20, ovary 3-7 mm long, stigma bilobed, slightly capitate, densely pubescent. Monocarps sessile to stipitate, stipes 0-8 mm long, 3-10 mm in diameter; monocarps 1 to 10, 22-55 mm long, 17-32 mm in diameter, ellipsoid to globose, apex rounded, glabrous, smooth, dumpy; seeds 8 to 23 per monocarp, 13-29 mm long, 3-14 mm in diameter, ellipsoid to oblong; aril absent. Distribution. A widespread species with a disjunct distribution in West and Central Africa, from Côte d’Ivoire to Ghana, and from Nigeria to Gabon. In Cameroon known from the Littoral, South, and South-West regions. Habitat. A common species when present; in lowland and premontane primary and old secondary rain forests, can be found in swamp forests. Altitude 50-1000 m a.sl. Local and common names known in Cameroon. Ikeinju (Bakweri language, Mbani 14). IUCN conservation status. Near Threatened (NT) (Tchouto 1998). This old assessment is certainly wrong, as U. connivens is quite common across Cameroon, and in general across the region. Uses in Cameroon. None reported. Notes. Uvariodendron connivens can be distinguished by its long (> 55 cm) narrowly elliptic or narrowly oblong leaves, with a rounded base. When compared to other species with long leaves such as U. fuscum and U. calophyllum, it can be distinguished by its longer flower pedicel 6-40 mm long and slightly imbricate sepals. The mature petals are wine red in color, unique for Cameroonian Uvariodendron. Stamen count was taken from Meinke (2008). Specimens examined. South Region: ca 6 km S of Kribi 2-4 km E of Gr Batanga, 2.88°N, 9.916°E, 26 September 1969, Bos J.J. 5412 (P,WAG); Campo Ma an National Park 5 km after main entrance, 2.35°N, 10.25°E, 15 February 2012, Couvreur T.L.P. 383 (WAG,YA); 29 km east from Lélé village, 2.27°N, 13.29°E, 09 September 2013, Couvreur T.L.P. 484 (WAG,YA); Bipindi, 3.08°N, 10.42°E, 01 January 1903, Zenker G.A. 2624 (B,K,L,M,P,WAG); Bipindi, 3.08°N, 10.42°E, 01 January 1904, Zenker G.A. 3204 (K,L,M,MO,P,P); Mimfia, 3.06°N, 10.38°E, 01 September 1913, Zenker G.A. 358 (M,P,U,WAG). South-West Region: Mabeta 6 km SE Limbe SBL, 3.98°N, 9.283°E, 10 August 1993, Baker W.J. 294 (K,YA); Ekundu Kundu, 5.12°N, 8.895°E, 27 April 1996, Cable S. 2230 (K,YA); Dikulu, 3.98°N, 9.233°E, 17 December 1993, Cable S. 611 (K,YA); Liwenyi, 4.37°N, 9.013°E, 28 October 1993, Cheek M. 5180 (K,YA); ca 40 minutes walk N then E from Njonji Hunters path to Lake Njonji, 4.13°N, 8.993°E, 18 November 1993, Cheek M. 5462 (K,YA); Ekundu Kundu, 5.13°N, 8.869°E, 25 April 1996, Cheek M. 8164 (K,YA); Mount Cameroon National Park on the Bomona trail behind Bomona village 10 km NW from Idenau, 4.29°N, 9.078°E, 03 April 2016, Couvreur T.L.P. 1051 (WAG,YA); Mokoko Forest Reserve Boa / Likinge, 4.42°N, 8.972°E, 31 May 1994, Ekema S.N. 1078 (K,YA); Bakolle Bakossi on Kumba-Mamfe road, 5.01°N, 9.666°E, 24 May 1986, Etuge M. 156 (K,MO,WAG,YA); Nyasoso, 4.81°N, 9.683°E, 24 June 1996, Etuge M. 2396 (K,YA); Mungo FR, 4.73°N, 9.560°E, 22 February 2006, Etuge M. 6506 (K); Mahole-Bintulu road, 4.79°N, 9.603°E, 24 November 1999, Gosline W.G. 209 (K,WAG,YA); Mabeta-Moliwe, 3.98°N, 9.25°E, 06 April 1992, Jaff B. 73 (K,YA); Rivières de Mosongosele et de Ndian depuis Mosongosele jusqu’à l’entrée amont de la mangrove environ 20 km SW de Mundemba, 4.83°N, 8.765°E, 13 June 1976, Letouzey R. 15175 (P,YA); Buea are at Bolifamba, 4.13°N, 9.303°E, 01 January 1929, Maitland T.D. 537 (K,P); Bomana-Koto Road c 500 m Bearing 305 deg towards Onge river, 4.31°N, 9.016°E, 18 October 1993, Ndam N. 708 (K,YA); Bolo forest 5 kms west of Kumba-Mamfe road near Konye, 4.86°N, 9.429°E, 25 March 1986, Nemba J. 56 (U); Mont versant de Idenao, 4.24°N, 8.99°E, 23 January 1985, Nkongmeneck B.A. 959 (YA); Bechati-Fossimondi-Besali forest Path leading from Fossimondi to Besali, 5.64°N, 9.966°E, 28 April 2005, Tchiengue B. 2204 (K,YA); Above Isobe, 4.16°N, 9°E, 10 June 1992, Tekwe C.F. 87 (K,YA); Mount above small Koto village, 4.3°N, 9.1°E, 06 March 1985, Thomas D.W. 4447 (K,P,YA); 3 km N of Limbe-Idenao road, 4.05°N, 9.083°E, 10 February 1986, Thomas D.W. 5537 (YA); Matene from Mbilishe, 6.25°N, 9.37°E, 01 March 1987, Thomas D.W. 6928 (P,YA); west of the Onge River and ridges on "Thump Mount", 4.33°N, 8.95°E, 09 November 1993, Thomas D.W. 9875 (K,YA); ca 5 km North East of Limbe TB + 5500 m, 4°N, 9.25°E, 02 June 1992, Watts J. 336 (K,YA); Mabeta-Moliwe TD 5835 m, 4.01°N, 9.266°E, 24 June 1992, Wheatley J.I. 326 (K,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 390-392, DOI: 10.3897/phytokeys.207.61432, {"references":["Tchouto, P, 1998. Uvariodendron connivens. The IUCN Red List of Threatened Species: e.T34766A9883333. https://doi.org/10.2305/IUCN.UK.1998.RLTS.T34766A9883333.en","Meinke, S, 2008. Studies on the morphology and pollination biology of selected West African Annonaceae. M.Sc. University of Rostock."]}

Annona L., Sp. Pl. 1: 536, 1753 Guanabanus = Guanabanus Mill. Gard. Dict. Abr., ed. 4: 2, 1754. Type species. Annona muricata L. Description. Trees, 1-10 m tall, d.b.h. 2-10 cm; stilt roots or buttresses absent. Indumentum of simple hairs. Leaves: petiole 7-20 mm long, 1-3 mm in diameter, blade 6-25 cm long, 4-19 cm wide, broadly obovate or obovate to broadly elliptic to elliptic, apex rounded or obtuse or shortly emarginated, base subcordate to rounded, discolorous, whitish below or concolorous; midrib sunken or flat; secondary veins 7 to 16 pairs; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young and old leafless branches, leaf opposed. Flowers with 9 perianth parts in 3 whorls, 1 to 2 per inflorescence; flowering peduncle sometimes present, short; pedicel 10-25 mm long; in fruit 15-50 mm long; bracts 2, all basal, 1-5 mm long; sepals 3, valvate, free, 3-4 mm long, triangular to ovate, apex acute, base truncate; petals free; outer petals longer than inner; outer petals 3, valvate, 10-15 mm long, 8-10 mm wide, ovate, apex acute, base truncate; inner petals 3, valvate, 8-10 mm long, 3-4 mm wide, narrowly oblong or narrowly elliptic, apex acute to obtuse, base truncate; stamens numerous (not counted), in 2 to 3 rows, 2-3 mm long, linear; connective discoid, shortly pubescent; staminodes absent; carpels free, numerous (not counted), ovary 1-2 mm long, stigma capitate, glabrous or pubescent. Fruit pseudosyncarpous, 20-50 mm long, 20-50 mm in diameter, obovoid to globose; monocarps sessile, completely fused between them, numerous (not counted); seed 1, 8-10 mm long, 4-5 mm in diameter, flattened ellipsoid, irregular in shape; aril absent. A mainly South American genus, one of the largest in Annonaceae with about 170 accepted species (Rainer 2001). In Africa, there are between three or four native species, with numerous subspecies and varieties and of which the taxonomy remains complicated (Robyns and Ghesquière 1934; Sillans 1952; Le Thomas 1969c). Annona glabra L. is probably of South American origin (Le Thomas 1969b, 1969c) but is naturalized along the coast of West and Central Africa. In Cameroon it is also found in mangrove areas, but is little collected (e.g. van der Burgt 130 (WAG)) We thus include it in the key, but do not provide a description. In addition, this genus contains the non-native edible species Annona squamosa L., A. muricata L. and A. reticulata L. (from South America), all of which can be found in cultivation (not included in the descriptions) in Cameroon. Taxonomy. no recent revision, but see Le Thomas (1969c), Le Thomas (1969b)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 40-41, DOI: 10.3897/phytokeys.207.61432, {"references":["Rainer, H, 2001. Nomenclatural and taxonomic notes on Annona (Annonaceae). Annalen des Naturhistorischen Museums in Wien Serie B Botanik und Zoologie 103: 513 - 524","Robyns, W, Ghesquiere, J, 1934. Essai de revision des especes africaines du genre Annona L. Bulletin de la Societe Royale de Botanique de Belgique/Bulletin van de Koninklijke Belgische Botanische Vereniging 67: 7 - 57","Sillans, R, 1952. Annonacees nouvelles ou litigieuses de l'Oubangui-Chari. Bulletin du Museum Natlurelle d'Histoire Naturelle, Serie 2 24: 578-581.","Le Thomas, A, 1969c. Mise au point sur deux Annona africaines. Adansonia, ser. 2 2: 95-103.","Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371"]}

Monanthotaxis paniculata P.H.Hoekstra, Phytotaxa 186(2): 106, 2014 Figs 65, 66; Map 8G Type. Gabon. Ogooué-Ivindo; north of Koumameyong along SHM lumber roads, McPherson G.D. 16123, 31 Jan 1993: holotype: WAG[WAG0357246, WAG0357247]; isotypes: LBV n.v., MO n.v., P[P01967243]. Description. Liana, 20 m tall, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrescent, young foliate branches densely pubescent with appressed reddish-brown hairs 0.5 mm long. Leaves: petiole 4-8 mm long, ca. 1 mm in diameter, densely pubescent, slightly grooved, blade inserted on top of the petiole; blade 8.5-23.5 cm long, 3.3-6.6 cm wide, ovate to oblanceolate, apex acuminate to acute, acumen 0.5-2.7 cm long, base cuneate to broadly cuneate with small linear black glands, chartaceous, below densely pubescent with yellowish hairs when young, sparsely pubescent to glabrous when old, above sparsely pubescent when young, glabrous when old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below sparsely pubescent when young and old; secondary veins 10 to 16 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on old leafless branches, axillary or terminal. Flowers with 9 perianth parts in 2 whorls, numerous per inflorescence, peduncle 5.5-27 cm long, panicle-like; pedicel 5-27 mm long, 0.5-1 mm in diameter, densely pubescent with short reddish brown hairs; in fruit 20-30 mm long, 2-3 mm in diameter, pubescent; bracts 2, one basal and one upper towards the middle or lower half of pedicel, basal bract 1-8 mm long, ca. 1 mm wide; upper bract ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, 0.5-1 mm long, 1-1.5 mm wide, broadly ovate, apex obtuse, base truncate, densely pubescent outside, glabrous inside, margins flat; petals free, petals 6 in one whorl, ca. 3 mm long, ca 1.5 mm wide, ovate, apex rounded to obtuse, base truncate, margins flat, sparsely pubescent outside, sparsely pubescent inside; stamens 6, in 1 row, inserted on a black hexagonal disc, opposite to the petals, free at the base, ca. 1 mm long, obconic; connective truncate, kidney-shaped in dorsal view, glabrous; staminodes 6, alternating with the stamens, glabrous; carpels free, 14 to 24, ovary ca. 2 mm long, stigma shortly bilobed, acute, glabrous. Monocarps stipitate, stipes 3-4 mm long, 3-4 mm in diameter; monocarps 2 to10, 15-30 mm long, 10-15 mm in diameter, not moniliform, ellipsoid, apex rounded, pubescent, smooth, green when ripe; seed 1 per monocarp, ca. 10 mm long, ca. 8 mm in diameter, ellipsoid; aril absent. Distribution. A central African species from Gabon and Cameroon; in Cameroon known from Littoral and South regions. Habitat. A rare species in Cameroon; in lowland primary or old secondary rain forests. Altitude 300-350 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Endangered (EN) (Hoekstra et al. 2021). Uses in Cameroon. None reported. Notes. Monanthotaxis paniculata is distinguished by the long appressed yellowish pubescence on lower side of the leaf blade, its inflorescence in a large panicle-like rhipidium (unique in the genus) and its flowers with one whorl of 6 petals. It is morphologically close to M. congoensis, but differs by its panicle-like inflorescence, depressed-globose floral buds, stamens inserted on a black hexagonal disc, and connective appendage kidney-shaped in dorsal view. Fruits were unknown when the species was first published (Hoekstra et al. 2014) but have since been collected (Couvreur 1108) and fruits are described here for the first time. The presence of Monanthotaxis paniculata in Cameroon is only based on two sterile collections, and needs to be confirmed with fertile material. Specimens examined. Littoral Region: Mambe Massif above Boga village 100 km along road from Yaoundé to Ed 3.90°N, 10.77°E, 19 June 2014, Couvreur T.L.P. 651 (WAG,YA). South Region: Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.47°N, 10.34°E, 14 February 2015, Couvreur T.L.P. 708 (WAG,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 223-226, DOI: 10.3897/phytokeys.207.61432, {"references":["Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01","Hoekstra, PH, Chatrou, LW, Wieringa, JJ, 2014. A new species of Monanthotaxis from Gabon with a unique inflorescence type for Annonaceae. Phytotaxa 186: 106 - 112, DOI: https://doi.org/10.11646/phytotaxa.186.2.5"]}

Piptostigma pilosum Oliv., J. Linn. Soc., Bot. 8: 159, 1964 Figs 92, 94; Map 12A = Piptostigma giganteum Hutch. & Dalziel, Bull. Misc. Inform. Kew: 151, 1927. Type. Nigeria. Cross River State, Oban District, Talbot P.A. 1336, no date: holotype: K[K000199007]; isotype: K[K000199006]. = Piptostigma latipetalum Baker f.; nom. nud. Type. Nigeria. Cross River State; Old Calabar, Thomson W.C. 61, no date: holotype: K[K000199008]; isotype: B[B100154081]. Description. Tree, up to 12 m tall, d.b.h. 8-10 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches densely pubescent. Leaves: petiole 2-4 mm long, 2-3 mm in diameter, densely pubescent, cylindrical, blade inserted on top of the petiole; blade 25-41 cm long, 9-17.2 cm wide, narrowly elliptic to elliptic or narrowly obovate to obovate, apex acuminate, acumen 1.1-2.7 cm long, base rounded to cordate, subcoriaceous, below sparsely pubescent when young and old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above densely pubescent when young and old, below densely pubescent when young, densely pubescent when old; secondary veins 20 to 28 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous or on old leafless branches, axillary, peduncle like base ca. 10 mm long, axial internodes 3-23 mm long, compact to sublax, sympodial rachis 35-50 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 3 per inflorescence; pedicel 10-25 mm long, ca. 3 mm in diameter, tomentose; in fruit 10 mm long, 3 mm in diameter, tomentose; basal bract ca. 12 mm long, ca. 5 mm wide; upper bract ca. 12 mm long, ca. 5 mm wide; sepals 3, valvate, free, 7-8 mm long, 6-7 mm wide, ovate, apex acute, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, 7-8 mm long, 3-3.5 mm wide, obovate, apex acuminate, base truncate, light yellow cream to red towards the base, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 30-60 mm long, 8-15 mm wide, elliptic, apex acute, base truncate, pink, margins wavy, pubescent to densely pubescent outside, pubescent inside; stamens numerous, in 6 to 8 rows, 1 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 5 to 8, ovary ca. 1 mm long, stigma globose, pubescent. Monocarps sessile, 2 to 5, 13-30 mm long, 8-18 mm in diameter, ellipsoid to ovoid, apex cuspidate, pubescent, finely warty, longitudinally ribbed with ca. 6 ribs, light yellow to orange when ripe; seeds up to 7 per monocarp, 1.5-3.5 mm long, 2-3 mm in diameter, ellipsoid; aril absent. Distribution. A central African species, from south eastern Nigeria to Gabon; in Cameroon known from East, South and mainly South-West regions. Habitat. A fairly uncommon species; in the understory of primary and old secondary rain forests. Altitude 50-390 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019a q). Uses in Cameroon. None reported. Notes. Piptostigma pilosum resembles P. macrophyllum because of the large size of their leaf blades (25-41 cm in both species). However, the leaf blades of P. pilosum are mostly elliptic (sometimes however they can be obovate) with a rounded or cordate base, while those of P. macrophyllum are always obovate with an acute to obtuse base and the flowering pedicel is longer (10-25 mm versus 8-10 mm in Piptostigma macrophyllum). The inflorescence of P. pilosum generally presents few flowers per inflorescence (1 to 3) while there are 3 to 6 in P. macrophyllum. The species P. fugax and P. oyemense also have few flowers per inflorescence (1) but these species have fewer carpels (1 to 3 versus 5 to 8 in P. pilosum). Specimens examined. East Region: 78 km south of Yokadouma 30 km after Ngato 15 km after river ALPICAM 'base de vie’ then 40 km on forestry road starting 4 km before Maséa village, 3.15°N, 14.72°E, 05 March 2019, Couvreur T.L.P. 1204 (MPU,WAG,YA). South-West Region: Near Bai Kuke SE of Mbonge, 4.53°N, 9.11°E, 25 January 1958, Keay R.W.J. 37372 (P); Along footpath from Ndian River at PAMOL field 69 and transect P, 5.01°N, 8.833°E, 24 January 1985, Thomas D.W. 4311 (P,YA); Korup National Park, 5.01°N, 8.833°E, 12 April 1985, Thomas D.W. 4755 (MO); Limbe W of Njonji Lake, 4.13°N, 9.016°E, 27 January 1994, Wieringa J.J. 2030 (U,WAG)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 305-307, DOI: 10.3897/phytokeys.207.61432, {"references":["Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371","Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019a. Annickia affinis. The IUCN Red List of Threatened Species: e.T132512369A132513599. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132512369A132513599.en"]}

Artabotrys R.Br., Bot. Reg. 5: 423, 1820 = Ropalopetalum Griff. Not. Pl. Asiat. 4: 716, 1854. Description. Lianas, up to 30 m tall, d.b.h. up to 20 cm; stilt roots or buttresses absent. Indumentum of simple hairs or absent. Leaves: petiole 1-15 mm long, 1-2 mm in diameter; blade 7-26 cm long, 2.5-14 cm wide, elliptic to ovate to obovate to oblong, apex acuminate to acute, base decurrent to subcordate, concolorous; midrib sunken or flat; secondary veins 7 to 16 pairs; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, leaf opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 90 per inflorescence; pedicel 2-25 mm long; in fruit 2-25 mm long; bracts 2, all basal, minute, soon falling; sepals 3, valvate, free, 1-15 mm long, triangular, apex acute, base truncate; petals free, sub equal; outer petals 3, valvate, 5-35 mm long, 1-14 mm wide, ovate to elliptic to linear to tubular, apex acute to rounded, base broad and concave; inner petals 3, valvate, 5-30 mm long, 1-9 mm wide, ovate to elliptic to linear to tubular, apex acute to rounded, base broad and concave, forming a pollination chamber over the receptacle; stamens 15 to 70, in 2 to 5 rows, 2-3 mm long, linear or cuneiform; connective discoid, glabrous or pubescent; staminodes absent; carpels free, 3 to 32, ovary 1-4 mm long, stigma bilobed or cylindrical, pubescent or glabrous. Monocarps sessile or substipitate, stipe, when present 1-25 mm long, 1 to 20 monocarps, 6-60 mm long, 5-25 mm in diameter, ellipsoid to obovoid, apex rounded to apiculate, smooth or verrucose; seed 1 to 2, 5-25 mm long, 5-15 mm in diameter, ellipsoid or flattened ellipsoid; aril absent. Type species. Artabotrys odoratissimus R.Br., nom. illegit. (≡ Annona hexapetala L.f., ≡ Artabotrys hexapetalus (L.f.) Bhandari). A genus of lianas with around 105 species distributed across the paleotropics in South East Asia, Australia, Madagascar and Africa (Chen et al. 2019); eight species occur in Cameroon, one endemic. Genus easily identifiable by its lianescent habit with the presence of characteristic inflorescences in form of a hook (the peduncle) and flowers that have a broad and concave base. Taxonomy. To date there are no taxonomic revisions for Artabotrys in Africa, but see Le Thomas (1969b), Boutique (1951b) and Paiva (1966).

Xylopia calva D.M.Johnson & N.A.Murray, PhytoKeys 97: 154, 2018 Map 17E Type. Cameroon. South Region; Bipindi, Zenker G.A. 4747, 1903: holotype: BM[000511011]; isotypes: BR[BR0000014581892]; G; K; L[0191105]; M; MO[751089]; P. Description. Tree, height unknown, d.b.h. up to 30 cm; buttresses present. Old branches glabrous, young branches pubescent, the hairs 0.3-0.4 mm long. Leaves: petiole 3-10 mm long, 2 mm wide, sparsely pubescent, slightly grooved, blade inserted on top of the petiole; blade 10-17.2 cm long, 3.6-6.5 cm wide, elliptic to oblong, apex acuminate, acumen 0.3-2.1 cm long, base cuneate to rounded, papyraceous to subcoriaceous, below sparsely pubescent when young, sparsely pubescent when old, above glabrous when young, sparsely pubescent when old; concolorous or slightly glaucous abaxially; midrib sunken, above sparsely pubescent when young and old, below sparsely pubescent when young and old; secondary veins 8 to 15 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, axillary, peduncle branched, 1-3 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 10 per inflorescence; pedicel 5-8 mm long, 1-2 mm in diameter, pubescent; in fruit 6-7 mm long, 2-3 mm in diameter, rusty pubescent; bracts 1 to 2, one basal and one upper towards the middle of pedicel, 2-3 mm long, 2-3 mm wide; sepals 3, valvate, basally fused, 4-5 mm long, 4-5 mm wide, ovate, apex acute to obtuse, base truncate, densely pubescent outside, glabrous inside; petals free, subequal; outer petals 3, 13-23 mm long, 3.8-6 mm wide at base, oblong-lanceolate, apex obtuse, base broad and concave, light yellow, pubescent, base glabrous outside, pubescent inside; inner petals 3, valvate, 10-17.5 mm long, 2.5-4 mm wide at base, oblong-lanceolate, apex acute, base broad and concave, yellow with red on the inner base, pubescent outside, glabrous inside except at apex; stamens ca. 200, in 5 to 6 rows, 1-2 mm long, oblong; connective apex shield-like, glabrous, red; carpels ca. 9, ovaries 2 mm long, stigmas connivent at base, linear, slightly thickened at the midpoint, ca. 2.2 mm long, pubescent. Monocarps stipitate, stipe ca. 3 mm long, ca. 7 mm in diameter; monocarps ca. 8, ca. 32 mm long, ca. 17 mm wide, ellipsoid, apex rounded, pubescent, verrucose and slightly wrinkled when dried, color unknown; seeds 7 to 8 per monocarp, in two rows, ca. 9 mm long, ca. 7 mm wide, ellipsoid to flattened ellipsoid, sarcotesta unknown; aril absent. Distribution. From southern Nigeria to Cameroon; in Cameroon known only from the South region. Habitat. A rare species, known from three collections, two in Cameroon. Altitude 150-200 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Endangered (EN) (Cosiaux et al. 2019a y). Uses in Cameroon. None reported. Notes. The relatively broad petals of X. calva are distinctive in the absence of hairs on the inner surface except at the apex. Xylopia calva has a pedunculate and branched inflorescence type similar to that found in X. phloiodora and X. paniculata. Specimens examined. South Region: Près des chutes du Ntem ou de Menvé’élé près Nyabessan (60 km Est de Campo), 2.39°N, 10.35°E, 08 April 1970, Letouzey R. 10306 (P,YA); Bipindi, 3.08°N, 10.41°E, 01 January 1913, Zenker G.A. 4747 (BM,BR,G,K,L,M,MO,P)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 453-454, DOI: 10.3897/phytokeys.207.61432, {"references":["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019a. Annickia affinis. The IUCN Red List of Threatened Species: e.T132512369A132513599. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132512369A132513599.en"]}

Neostenanthera neurosericea (Diels) Exell, J. Bot. 73 (Suppl.): 6, 1935 Figs 82, 83; Map 10F ≡ Stenanthera neurosericea Diels, Bot. Jahrb. Syst. 39. 483, 1907. = Neostenanthera platypetala (Engl. & Diels) Pellegr., Bull. Soc. Bot. France Mém. 1949: 56. 1950; ≡ Stenanthera platypetala Engl. & Diels, Bot. Jahrb. Syst. 39. 482, 1907. ≡ Boutiquea platypetala (Engl. & Diels) Le Thomas. Adansonia sér. 2, 5: 532, 1965. Syn. nov. Type. Cameroon. South Region; Bipindi, Zenker G.A. 2877, Mar 1904: lectotype, sheet here designated: B[B 10 0154069]; isotypes: B[B 10 0154071]; BM[BM000546878]; K[K000199036]. = Stenanthera macrantha Mildbr. & Diels, Bot. Jahrb. Syst. 1111. 445, 1915. Type. Cameroon. South Region, Kribi, Mildbraed G.W.J. 5886, Jul 1911: holotype: B[B 10 0154070]; isotype: HBG[HBG502540]. Type. Cameroon. South Region; Bipindi, Zenker G.A. 3105, 1904: lectotype, sheet here designated: B[B 10 0154067]; isotypes: B[B 10 0390251]; BR[BR0000008824059]; GOET[GOET005682]; G[G00014887, G00014888]; L[L0038043]; LISC[LISC000393]; HBG[HBG502533]; MO[MO-216971]; M[M0107916]; P[P00363312]; S[S07-13457]; WAG[WAG0000096]. Description. Tree to shrub, up to 7 m tall, d.b.h. 3-6 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches sparsely pubescent, young foliate branches densely pubescent. Leaves: petiole 4-5 mm long, ca. 1 mm in diameter, densely pubescent, grooved, blade inserted on top of the petiole; blade 15-21 cm long, 5-8 cm wide, ovate to elliptic, apex acuminate, acumen 1-2 cm long, base rounded, papyraceous, below densely pubescent with erect slight curly hairs when young and old, densely pubescent when old, above glabrous when young and old, concolorous or discolorous, whitish below; midrib sunken or flat, above glabrous when young and old, below densely pubescent when young, densely pubescent when old; secondary veins 15 to 21 pairs, glabrous below; tertiary venation percurrent. Individuals bisexual; inflorescences cauliflorous or ramiflorous on old leafless or young foliate branches, leaf opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 2 per inflorescence; peduncule ca. 2 mm long, unbranched; pedicel 10-30 mm long, ca. 1 mm in diameter, densely pubescent; in fruit 20-30 mm long, 2-3 mm in diameter, densely pubescent; bract 1, basal, ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, 2-3 mm long, 1-2 mm wide, triangular, apex acute, base truncate, green, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner; outer petals 3, 15-33 mm long, 8-15 mm wide, thick, elliptic, apex acute, base narrowed and concave, light green to light yellow to cream, margins flat, pubescent outside, pubescent inside; inner petals 3, valvate, 10-15 mm long, 3-5 mm wide, triangular, apex acute, base broad and concave, light green to cream, margins flat, pubescent outside, glabrous inside; stamens 30 to 40, in 5 to 6 rows, 2-3 mm long, linear; connective tongue shaped, glabrous, red; staminodes absent; carpels free, 20 to 25, ovary ca. 2 mm long, stigma cylindrical, glabrous. Monocarps sessile, 7 to 15, 20-30 mm long, ca. 20 mm in diameter, ellipsoid, apex apiculate, pyramidal in shape, pubescent, wrinkled, brown when ripe; seed 1 per monocarp, 11-14 mm long, 10-11 mm in diameter, ellipsoid; aril absent. Distribution. From Cameroon to Gabon; in Cameroon known from the South, Central Littoral and South-West regions. Habitat. A common species when present; in primary or old secondary rain forests, non-inundated soils. Altitude 200-600 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cheek 2014a) (as Boutiquea platypetala). Uses in Cameroon. None reported. Notes. This species is closely related to N. myristicifolia but differs by having densely pubescent young foliate branches and sessile and pyramidal monocarps (versus clearly stipitate and ellipsoid monocarps). We transfer Boutiquea platypetala (Engl. & Diels) Le Thomas back into the genus Neostenanthera. This species was initially described in the genus Stenanthera (Diels 1907), then transferred to Neostenanthera (Pellegrin 1949) until Le Thomas (1965b) erected the genus Boutiquea to accommodate it mainly because of its characteristic sessile monocarps (versus long-stipitate in Neostenanthera s.str.). Besides that, all other morphological characters are common with Neostenanthera (Fero et al. 2014), such as overall flower morphology (e.g. broad and concave inner petal bases), septate anthers, carpels with single ovules and consequently single seeded monocarps (rare in Cameroonian Annonaceae, but a character of the tree genus Annickia too). In the latest revision of the genus Neostenanthera, Fero et al. (2014) didn’t consider Boutiquea as congeneric with Neostenanthera. However, recent molecular data (Guo et al. 2017a; Couvreur et al. 2019) revealed that B. platypetala is phylogenetically very close to Neostenanthera, which is coherent with morphology. The occurrence of species with stipitate and sessile monocarps in the same genus is not uncommon in Annonaceae, for example in Artabotrys or Uvaria, and this character thus does not appear sufficient to warrant the separate generic status suggested by Le Thomas (1965b). In addition, we also consider the name Neostenanthera platypetala as a synonym of Neostenanthera neurosericea the latter being the older name and thus takes precedence. Both names have already been tentatively suggested to be conspecific based on morphological similarities (Diels 1907; Fero et al. 2014). A close examination of the material of N. neurosericea (only known from the flowering type collection) and N. platypetala reveals no major differences, in particular the dense pubescence of young foliate branches, the shape of the leaves (rounded at base, clearly acuminate at apex and obovate in shape), the solitary flowers borne on the branches, and the shape and size of the petals are similar. Specimens examined. Central Region: Bank Nyong River near the new bridge ca 65 km SSW of Eséka, 3.53°N, 10.41°E, 16 July 1964, de Wilde W.J.J.O 2840 (WAG); 16 km SSW d’Eséka, 3.65°N, 10.78°E, 02 January 1974, Letouzey R. 12550 (P,WAG,YA); Route Vetère (Likouk-Lokoundji), 3.48°N, 10.32°E, 14 January 1974, Mezili P. 251 (P,YA). Littoral Region: Ebo Bekob abandoned village CRES research station, 4.36°N, 10.41°E, 21 April 2005, Etuge M. 6447 (K). South Region: Campo Ma an National Park 5 km after main entrance, 2.34°N, 10.25°E, 15 February 2012, Couvreur T.L.P. 384 (WAG,YA); Campo Ma an National Park 5 km after main entrance, 2.35°N, 10.25°E, 15 February 2012, Couvreur T.L.P. 386 (WAG,YA); Entre Fenda (60 km ESE de Kribi et riviere Kienke), 2.8°N, 10.4°E, 22 January 1962, Letouzey R. 4092 (K,P,YA); Elom (Kribi), 2.78°N, 10.25°E, 25 April 1968, Letouzey R. 9436 (P); 55 km ESE de Kribi 2 km W du village, 3.21°N, 10.06°E, 12 March 1963, Raynal A. 10389 (P,YA); Assok (Nyabessan), 2.77°N, 10.47°E, 18 February 1965, Raynal A. 13457 (P,YA); 44 km N de Nyabesssan Réserve forestière de Kienké-sud 500 m N de la route, 2.78°N, 10.37°E, 18 February 1965, Raynal A. 13472 (P,YA); Campo-Ma’an area Bibambivoto, 2.24°N, 10.26°E, 23 August 2000, Tchouto Mbatchou G.P. 2986 (KRIBI,WAG,YA); Campo-Ma’an area Mvini, 2.33°N, 10.20°E, 25 August 2002, Tchouto Mbatchou G.P. CORIX_3 (WAG); Campo-Ma’an area Mvini, 2.27°N, 10.18°E, 14 September 2000, Tchouto Mbatchou G.P. 3035 (KRIBI,WAG); Campo-Ma’an area Bifa, 2.65°N, 10.28°E, 12 October 2001, Tchouto Mbatchou G.P. 3298 (KRIBI,WAG); Korup National Park Primary rain forest, 5.03°N, 8.833°E, 01 March 1987, Thomas D.W. 6891 (MO); Bipindi, 3.08°N, 10.42°E, 1898, Zenker G.A. 1904 (K); Bipindi, 3.08°N, 10.42°E, 20 June 1904, Zenker G.A. 2877 (B; Bipindi, 3.08°N, 10.42°E, 01 January 1918, Zenker G.A. 29 (P); Bipindi, 3.08°N, 10.42°E, 01 January 1904, Zenker G.A. 3105 (L,P,WAG); Bipindi, 3.08°N, 10.42°E, 01 January 1908, Zenker G.A. 3749 (L,P); Bipindi, 3.08°N, 10.42°E, 01 January 1909, Zenker G.A. 3819 (E,L,M); Bipindi, 3.08°N, 10.41°E, Zenker G.A. 3897 (K); Bipindi, 3.08°N, 10.41°E, 01 December 1913, Zenker G.A. 440 (P); Bipindi, 3.08°N, 10.41°E, 01 November 1913, Zenker G.A. 440 (P,U,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1912, Zenker G.A. 4402 (L). South-West Region: Ekundu Kundu, 5.12°N, 8.895°E, 27 April 1996, Cable S. 2279 (K,YA); Mundemba, 5.05°N, 8.883°E, 05 March 1993, Gereau R.E. 5185 (MO,WAG); Between Ikenge ad Esukutang ca 6 km W of Ikenge, 5.27°N, 9.1°E, 03 April 1988, Thomas D.W. 7554 (MO,P,WAG,YA); Korup National Park, 5.33°N, 8.9°E, 22 May 1988, Thomas D.W. 7809 (MO,P)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 270-274, DOI: 10.3897/phytokeys.207.61432, {"references":["Cheek, M, 2014a. Boutiquea platypetala. The IUCN Red List of Threatened Species: e.T39475A2927181. https://doi.org/10.2305/IUCN.UK.2014-3.RLTS.T39475A2927181.en","Diels, L, 1907. Anonaceae africanae I. Botanische Jahrbuecher fuer Systematik, Pflanzengeschicht und Pflanzengeographie 39: 467 - 486","Pellegrin, F, 1949. Les Annonacees du Gabon (suite). Memoires Societe botanique de France 96: 52 - 73, DOI: https://doi.org/10.1080/00378941.1949.10839814","Le Thomas, A, 1965b. Un nouveau genre africain d'Annonacees: Boutiquea Le Thomas. Adansonia 5: 531 - 535","Fero, M, Aedo, C, Cabezas, F, Velayos, M, 2014. Taxonomic revision of Neostenanthera (Annonaceae). Systematic Botany 39: 17 - 30, DOI: https://doi.org/10.1600/036364414X678071","Guo, X, Tang, CC, Thomas, DC, Couvreur, TLP, Saunders, RMK, 2017a. A mega-phylogeny of the Annonaceae: taxonomic placement of five enigmatic genera and support for a new tribe, Phoenicantheae. Scientific Reports 7: e7323. https://doi.org/10.1038/s41598-017-07252-2","Couvreur, TLP, Helmstetter, AJ, Koenen, EJM, Bethune, K, Brandao, RD, Little, SA, Sauquet, H, Erkens, RHJ, 2019. Phylogenomics of the major tropical plant family Annonaceae using targeted enrichment of nuclear genes. Frontiers in Plant Science 9: e1941. https://doi.org/10.3389/fpls.2018.01941"]}

Polyceratocarpus microtrichus (Engl. & Diels) Ghesq. Ex Pellegr., Bull. Soc. Bot. France Mém: 68, 1950 Figs 95, 96; Map 12C ≡ Uvaria microtricha Engl. & Diels, Bot. Jahrb. Syst. 39: 473, 1907. Type. Cameroon. South Region; Bipindi, Zenker G.A. 2899, Mar 1904: holotype: B[B 10 0154089]; isotypes: BR[BR0000008804808]; K[K000199038]; M[M0107917]; P[P00363351]; S[S07-13391]. Description. Tree, up to 8 m tall, d.b.h. up to 10 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 5-8 mm long, 1-2 mm in diameter, sparsely pubescent to glabrous, slightly grooved, blade inserted on the side of the petiole; blade 14-34 cm long, 3.5-8 cm wide, oblong to elliptic, apex acuminate to acute, acumen 0.5-1 cm long, base acute, coriaceous, below sparsely pubescent when young, sparsely pubescent to glabrous when old, above glabrous when young and old, discolorous, whitish below; midrib sunken or flat, above glabrous when young and old, below glabrous when young and old; secondary veins 9 to 15 pairs, glabrous above; tertiary venation intermediate. Individuals unisexual (?, only male flowers and fruits seen), inflorescences ramiflorous on young foliate or old leafless branches, axillary; flowers with 9 perianth parts in 3 whorls, 2 to 4 per inflorescence; male flowers: pedicel 6-8 mm long, 3-4 mm in diameter, tomentose; bract 2-3 mm long, ca. 1 mm wide; sepals 3, valvate, basally or entirely fused, cup shaped, ca. 4 mm long, 7-8 mm wide, triangular to ovate, apex acute, base truncate, tomentose outside, glabrous inside, margins flat; petals free, subequal; outer petals 3, 10-14 mm long, 6-9 mm wide, oblong to elliptic, apex acute, base truncate, margins flat, densely pubescent outside, pubescent but glabrous towards the base inside; inner petals 3, valvate, 10-14 mm long, 5-7 mm wide, obovate to oblong, apex acute, base truncate, margins flat, tomentose outside, pubescent inside; stamens 90 to 110, in 7 to 10 rows, 2-3 mm long, linear to clavate; connective discoid, glabrous; staminodes absent; female flowers only seen in fruit; fruiting pedicel 10-20 mm long, glabrous. Monocarps sessile, 2 to 5, 20-30 mm long, 15-25 mm in diameter, obovoid, apex rounded, glabrous, smooth, slightly bumpy when dry, not ribbed, white when ripe; seeds 10 to 14 per monocarp, 5-10 mm long, 3-4 mm in diameter, ellipsoid; aril absent. Distribution. From Cameroon to Gabon, in Cameroon known from the South and South-West regions. Habitat. A rare species in Cameroon; in premontane primary rain forests. Altitude: 100-700 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not evaluated. Uses in Cameroon. None reported. Notes. See under P. parviflorus. The collection Watts 627 was suggested to be a new species (Cable and Cheek 1998, p. 11) but having seen the specimen in K, we have identified it as P. microtrichus. Specimens examined. South Region: 20 km SE of Kribi route minière E of Mt Eléphant, 2.78°N, 10.03°E, 01 April 1970, Bos J.J. 6679 (WAG); ca 45 km from Kribi ca 8 km N of Lolodorf road Forest towards Lokoundje R, 3.1°N, 10.25°E, 02 April 1970, Bos J.J. 6684 (BR,K,LD,LM,MO,P,WAG,YA); Ngovayang, 3.25°N, 10.57°E, 08 June 2015, Droissart V. 1881 (MO); Bipindi, 3.08°N, 10.42°E, 01 January 1904, Zenker G.A. 2899 (BR,L,P,WAG); Bipindi, 3.08°N, 10.42°E, 01 January 1907, Zenker G.A. 3270 (L,P); Bipindi, 3.08°N, 10.42°E, 01 December 1913, Zenker G.A. 478 (P,U,WAG). South-West Region: Mokoko Forest Reserve Dikome, 4.48°N, 9.033°E, 05 May 1994, Ekema S.N. 950 (K); Mokoko Forest Reserve ca 6 km W of Mundongo, 4.43°N, 9.083°E, 22 March 1993, Watts J. 627 (K)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 311-313, DOI: 10.3897/phytokeys.207.61432, {"references":["Cable, S, Cheek, M, 1998. The plants of Mt Cameroon: a conservation checklist. Kew Publishing. Royal Botanic Gardens, Kew London","Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371"]}

Monodora angolensis Welw., Apont. 587, 1859 Fig. 74; Map 9H = Monodora angolensis var. decidua Hiern, Cat. Afr. Pl. Welw. 1: 13, 1896. Type. Angola. Malanje, Golungo Alto, Welwitsch F.M.J. 776, Dec 1855: holotype: LISC; isotypes: B[B 10 0154049]; BM[BM000889328]; BR[BR0000008802026]; C[C10004780, C10004779]; COI[COI00077210]; G; K[K000198845, pro parte]; LISU[LISU206066, LISU206065]; P[P00363309]. = Monodora angolensis var. microphylla Hiern, Cat. Afr. Pl. Welw. 1: 13, 1896. Type. Angola. Malanje, Pungo Andongo, Welwitsch F.M.J. 775, Jan 1857: holotype: BM; isotype: K[K000198845, pro parte]. = Monodora durieuxii De Wild., Études Fl. Bas-et Moyen-Congo 1: 122, 1903. Type. Democratic Republic of the Congo. Equateur, Wangata, Dewèvre A.P. 613, 14 Jan 1896: lectotype, sheet here designated: BR[BR0000008802354]; isotypes: BR[BR0000008802682, BR0000008802743]. = Monodora letestui Pellegr., Bull. Soc. Bot. France 94: 386, 1947. Type. Gabon. Ogooué-Lolo, Lastoursville, Le Testu G.M.P.C. 7222, Apr 1929: lectotype, sheet here designated: P[P00363310]; isotypes: BM[BM000553855]; BR[BR0000008801692]; LBV n.v., LISC[LISC000382]; P[P00363311]. = Monodora louisii Boutique, Bull. Jard. Bot. État Brux. 21: 97, 1951. Type. Democratic Republic of the Congo. Orientale, Yangambi, Louis J.L.P. 6612, 15 Nov 1937: lectotype, sheet here designated: BR[BR0000006246730]; isotypes: BM[BM000553857]; BR[BR0000006247065]; C[C10004782, C10004781]; K[K000199023 K000199024]; NY n.v., P[P00363257]; PRE[PRE0774858-0]; S[S10-21167]. Type. Angola. Malanje; Pungo Andongo, Welwitsch F.M.J. 774, May 1855: holotype: LISC; isotypes: B[B 10 0190365]; BM[BM000553856]; COI[COI00077209]; G[G00011630]; K[K000198843, K000198844]. Description. Tree, 18-20 m tall, d.b.h. 10-25 cm; stilt roots or buttresses absent. Indumentum absent; old leafless branches glabrous, young foliate branches glabrous. Leaves: petiole 2-10 mm long, 1 mm in diameter, glabrous, weakly grooved adaxially, blade inserted on the side of the petiole; blade 4-20 cm long, 2-7.5 cm wide, elliptic, apex acuminate, acumen 0.5-1 cm long, base cuneate to obtuse, coriaceous to papyraceous, below glabrous when young and old, above glabrous when young and old, concolorous; midrib raised above, above glabrous when young and old, below glabrous when young and old; secondary veins 8 to 16 pairs, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, leaf opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 8-40 mm long, ca. 1 mm in diameter, glabrous; in fruit 25-85 mm long, 5-7 mm in diameter, glabrous; bract 1, towards the upper half of pedicel, 4-17 mm long, 3-12 mm wide; sepals 3, valvate, free, 5-15 mm long, 2-6 mm wide, ovate, apex acute, base truncate, green speckled with red and purple, glabrous outside, glabrous inside, margins undulate; petals basally fused, tube 2-3 mm long, inner and outer whorl differentiated, outer petals longer than inner; outer petals 3, 17-50 mm long, 10-30 mm wide, oblong-obovate, apex truncate, base truncate, red-brown with pale yellow spots towards the apex, margins wavy, glabrous outside, glabrous inside; inner petals 3, valvate, 4-11 mm long, 5-16 mm wide, cordate to rhombic, apex acuminate, base narrowed into a claw, claw 3.0-9 mm long, white tinged with yellow, minutely purple-mottled along margins, margins flat, glabrous outside, glabrous inside; receptacle convex to flat; stamens numerous, in 9 to 11 rows, 1 mm long, broad; connective discoid, glabrous, cream; staminodes absent; carpels fused into a single structure, 1-2 mm long, stigma bilobed, slightly capitate, glabrous. Fruit syncarpous, 35-80 mm long, 35-50 mm in diameter, globose to ovoid, apex apiculate, glabrous, rugose, bumpy, green to brown when ripe; seeds 9-13 mm long, 5-8 mm in diameter, ellipsoid; aril absent. Distribution. A widespread species from eastern Nigeria to northern Angola, Central African Republic, Democratic Republic of Congo, Uganda, western Tanzania and northern Zambia, with one collection from Ivory Coast; in Cameroon known from East, South, Central and Adamaoua regions. Habitat. Fairly uncommon in Cameroon; in primary, secondary, and montane rain forests, gallery forest, sometimes in dry forests. Altitude 0-1800 m a.s.l. Local and common names known in Cameroon. None recorded. Uses in Cameroon. None reported. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019y). Notes. Monodora angolensis is distinguished from other species by the combination of the following characters: entirely glabrous leaves and branches and clawed non undulated glabrous inner petals. Specimens examined. Central Region: Environs de Ndokalende 10 km SW de Ndikinimeki, 4.72°N, 10.78°E, 04 March 1984, Satabié B. 754 (P,WAG,YA). East Region: Molunda Sation Ngoko Nginda 21 km north of Molundu, 2.2°N, 15.2°E, 09 January 1911, Mildbraed G.W.J. 4199 (B,HBG). North Region: Tibati, 6.46°N, 12.63°E, 01 February 1909, Ledermann C.L. 2462 (B); km 10 Tibati-Mabouka road, 6.43°N, 12.7°E, 29 June 1972, Leeuwenberg A.J.M. 10034 (BR,K,MO,P,WAG,YA). South Region: 18 km east from Lélé village, 2.27°N, 13.32°E, 07 September 2013, Couvreur T.L.P. 461 (WAG,YA); 26 km east from Lélé village, 2.28°N, 13.31°E, 08 September 2013, Couvreur T.L.P. 477 (WAG,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 247-250, DOI: 10.3897/phytokeys.207.61432, {"references":["Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371","Couvreur, TLP, 2009. Monograph of the syncarpous African genera Isolona and Monodora (Annonaceae). Systematic Botany Monographs 87: 1 - 150","Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019y. Monodora angolensis. The IUCN Red List of Threatened Species: e.T132680437A133046240. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132680437A133046240.en"]}

Uvariopsis citrata Couvreur & Niangadouma, PhytoKeys 68: 1-8, 2016 Fig. 129; Map 15I Type. Gabon. Estuaire; Monts de Cristal, near first bridge after Kinguélé village, 0°46'66"N, 10°27'81"E, Couvreur T.L.P 1143, 14 Jun 2016: holotype: WAG; isotypes: LBV, P. Description. Tree, 4-10 m tall, d.b.h. 3-10 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 4-8 mm long, 3-5 mm in diameter, pubescent when young, pubescent to glabrous when old, grooved on top, blade inserted on top of the petiole, strong lemon scent when crushed; blade 31.2-50 cm long, 8.8-12 cm wide, elliptic to obovate, apex acuminate, acumen 2-3 cm long, base subcordate to cordate, coriaceous, below glabrous when young and old, above glabrous when young and old; midrib sunken or flat, above glabrous when young and old, below sparsely pubescent when young, glabrous when old; secondary veins 17 to 19 pairs per side, glabrous above; tertiary venation reticulate. Individuals unisexual, monoecious; inflorescences cauliflorous, sparsely spaced along the trunk mostly towards the lower half of the trunk. Flowers with 6 perianth parts in 2 whorls, ovoid to conical in bud, 1 to 2 per inflorescence, male and female inflorescences similar; pedicel 0-2 mm long, 1-2 mm in diameter, densely pubescent; in fruit unknown; bracts up to 3, all basal, 1-2 mm long, 4 mm wide; sepals 2, valvate, basally fused, enclosing the petals in bud, 9-15 mm long, 4-6 mm wide, narrowly ovate, apex acute, base truncate, densely pubescent with hairs appressed outside, densely pubescent or glabrous towards base inside, margins flat; petals 4, 7-15 mm long, 5-8 mm wide, ovate, apex acute, base truncate, brownish-greenish-yellow, margins flat, pubescent outside, glabrous inside; male flowers: stamen number unknown, 0.5 mm long, oblong, connective truncate, glabrous, pale yellow; female flowers: carpels free, ca. 60, ovary 4-5 mm long, ca. 0.5 mm wide, densely pubescent with long appressed hairs, stigma cylindrical coiled. Fruits unknown. Distribution. A species only known from southern Cameroon and two localities in Gabon (Monts de Cristal National Park, Mbé sector); in Cameroon known from the South Region. Habitat. A rare species; in mature or old secondary forests near rivers in periodically flooded soils, in flat valley bottoms or in well-drained forests on slope. Altitude 60-300 m a.s.l. Local and common names known in Cameroon. Ntala (Yaoundé, Letouzey 9017); Kakangula (Bagielli Pygmies, Letouzey 9017). IUCN conservation status. Data deficient (DD) (Cosiaux et al. 2019a x), but this assessment didn’t take in account the two specimens cited here form Cameroon. Uses in Cameroon. None reported. Notes. Uvariopsis citrata resembles U. sessiliflora by its (sub)sessile flowers (pedicels 0-2 mm long), but is easily distinguished by its strong lemon scent, longer leaves (31-50 vs 12-18 cm) and (sub)cordate leaf base (vs acute). The strong lemon scent is unique in the genus. This character has also been reported in Uvariodendron angustifolium and in U. molundense var. citrata (endemic to Gabon). This species was suggested to be endemic to Gabon (Couvreur and Niangadouma 2016), however we identified two specimens from southern Cameroon that fit this species morphologically (young foliate branches pubescent; leaves ca. 35 cm long and sessile ovoid flowers). Neither specimen mentions the citrus scent of the leaves. Letouzey 9017 however does mention that the leaves emit a strong smell when crushed, and the leaves are used to prepare fish dishes which gives them an "aromatic taste" (translated from French, “goût aromatique"). Specimens examined. South Region: A 15 km au SSE de Zingui (soit à 50 km au SE de Kribi), 2.82°N, 10.97°E, 14 March 1968, Letouzey R. 9017 (P,YA); Campo-Ma’an area Bibabimvoto, 2.21°N, 10.01°E, 13 May 2000, Tchouto Mbatchou G.P. 2869 (KRIBI,WAG,YA).

Uvaria afzelii Scott Elliot, J. Linn. Soc., Bot. 30(206): 70, 1895 Map 12I Type. Sierra Leone. Southern Province; between Kahreni and Port Lokko, Scott Elliot G.F. 5812, Apr 1891: holotype: K[K000198777]. Description. Liana, ca. 3 m tall, d.b.h. unknown. Indumentum of simple or fasciculate 4 or 3 branched hairs; old leafless branches sparsely pubescent to glabrous, young foliate branches hirsute. Leaves: petiole 3-4 mm long, 1 mm in diameter, densely pubescent erect hairs. Leaves: petiole 3-4 mm long, 1 mm in diameter, densely hirsute, slightly grooved, blade inserted on top of the petiole; blade 15-20 cm long, 4-6cm wide, oblong to ovate, apex acute, base cordate, subcoriaceous, below densely pubescent with fasciculate hairs when young, pubescent when old, above pubescent with simple hairs when young, sparsely pubescent to glabrous when old; midrib sunken or flat, above densely pubescent with simple hairs when young and old, below pubescent with fasciculate hairs when young and old; secondary veins 11-15 pairs, sparsely pubescent to glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, leaf opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 35-50 mm long, 1-2 mm in diameter, densely pubescent; in fruit 40-55 mm long, 2 mm in diameter, densely pubescent; bracts 2, one basal and one upper towards the lower part of the pedicel, basal bract 3-8 mm long, 2-3 mm wide; upper bract 3-7 mm long, 2-3 mm wide; sepals 3, valvate, basally fused, 8-10 mm long, 4-6 mm wide, ovate, apex obtuse, base truncate, pubescent outside, tomentose inside, margins flat; petals free, sub equal; outer petals 3, 17-22 mm long, 13-17 mm wide, ovate, apex obtuse, base truncate, yellow, margins flat, pubescent outside, densely pubescent inside; inner petals 3, imbricate, 13-20 mm long, 10-13 mm wide, ovate, apex obtuse, base attenuate, yellow, margins flat, pubescent outside, tomentose inside, hairs longer towards center; stamens 150 to 200, in 8 to 9 rows, 2-3 mm long, linear; connective tongue shaped, pubescent; staminodes absent; carpels free, 40 to 50, ovary 2-3 mm long, stigma conical, glabrous. Monocarps stipitate, stipes 35-45 mm long, 2-3 mm in diameter; monocarps 13 to 25, 13-18 mm long, 10-15 mm in diameter, club-shaped with the stipes inserted laterally, apex rounded or mucronate, densely pubescent with erect hairs, smooth, constricted around the seeds (2 or 3 bumps), yellow brown to pale orange when ripe; seeds 4 to 6 per monocarp, 12-15 mm long, 8-10 mm in diameter, flattened ellipsoid; aril absent. Distribution. A mainly west African species, just reaching into Cameroon with a single collection to date, in the North-West region. Habitat. A rare species in Cameroon (a single collection); along scrub vegetation near cultivation. Altitude 10-600 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not evaluated. Uses in Cameroon. None reported. Notes. Uvaria afzelii is easily recognized by the long golden erect hairs on the young foliate branches and petioles, leaf blades with the combination of simple hairs above and fasciculate hairs below, and especially by its unique club-shaped monocarps that are constricted around the seeds and densely pubescent with erect golden hairs. Specimen examined. North-West Region: Nser et Banji 50 km N Wum, 6.85°N, 10.12°E, 11 July 1975, Letouzey R. 14016 (P,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 330-331, DOI: 10.3897/phytokeys.207.61432

Isolona Engl., Nat. Pflanzenfam. Nachtr. I: 161, 1897 Type species. Isolona madagascariensis (A.DC.) Engl. & Diels (a species from Madagascar). Description. Trees, 3-30 m tall, d.b.h. 5-60 cm; stilt roots or buttresses absent. Indumentum of simple hairs or glabrous. Leaves: petiole 1-15 mm long, 1-4 mm in diameter, blade 8.5-29 cm long, 3-15 cm wide, elliptic or obovate or oblong, apex acuminate, base decurrent to rounded or acute, concolorous; midrib raised on upper surface; secondary veins 7 to 20 pairs; tertiary venation reticulate. Inflorescences ramiflorous on old leafless or young foliate branches, axillary. Flowers bisexual with 9 perianth parts in 2 whorls, 1 to 3 per inflorescence; pedicel 1-25 mm long, 1-2 mm in diameter; in fruit 2-29 mm long, 2-5 mm in diameter; bracts 2 to 7, several basal and one upper, lower half of pedicel; sepals 3, valvate, free, 1-9 mm long, 2-5 mm wide, ovate or elliptic, apex acute or acuminate or rounded, base truncate; petals 6, basally fused, tube 3-11 mm long, inner and outer whorl not differentiated, equal; lobes 6-31 mm long, 2-12 mm wide; stamens numerous, in 3 to 4 rows, 1-2 mm long, broad; connective discoid; staminodes absent; carpels fused - syncarpous, forming a single visible gynoecium, 1-3 mm long, stigma bilobed, slightly capitate or capitate. Fruit syncarpous, forming a single visible fruit, 30-90 mm long, 15-50 mm in diameter, ovoid or ellipsoid, apex apiculate or rounded or cuspidate; seeds numerous not seriate, 8-25 mm long, 5-15 mm in diameter, ellipsoid or flattened ellipsoid; aril absent. A genus of trees with 20 known species, 15 in Africa and 5 in Madagascar. In Cameroon nine species are known, none endemic. Isolona, together with its sister genus Monodora, are unique in Annonaceae in having truly syncarpous flowers (fused carpels) and fruits. This translates into single fruits with unordered seeds, in contrast to other genera which have either uni- or biseriate placentation. Petals in Isolona are basally fused forming a clearly visible tube, with six equal lobes of equal length in a single whorl. In the vegetative state, Isolona and Monodora (together with Polyceratocarpus pellegrinii) are characterized by a raised midrib, in contrast to a sunken or flat midrib in all other genera found in Cameroon. Taxonomy. Couvreur (2009)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 129-130, DOI: 10.3897/phytokeys.207.61432, {"references":["Couvreur, TLP, 2009. Monograph of the syncarpous African genera Isolona and Monodora (Annonaceae). Systematic Botany Monographs 87: 1 - 150"]}

Uvariodendron angustifolium (Engl. & Diels) R.E.Fr., Acta Horti Berg. 10: 58, 1930 Fig. 120; Map 15B ≡ Uvaria angustifolia Engl. & Diels, Notizbl. Königl. Bot. Gart. Berlin 2: 295, 1899. Type. Cameroon. South-West Region; Johann-Albrechtshöhe [Kumba], Staudt A. 742a, 20 Mar 1896; holotype: B[B 10 0153115]. Description. Tree to shrub, 3-12 m tall, d.b.h. unknown; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches glabrous to pubescent. Leaves: petiole 3-7.5 mm long, 1-2 mm in diameter, glabrous to pubescent, grooved, blade inserted on top of the petiole; blade 10-19.9 cm long, 3-5.8 cm wide, narrowly elliptic, apex acute to acuminate, acumen 1.1-1.4 cm long, base acute to cuneate, subcoriaceous, below glabrous to pubescent at base, glabrous when old, above glabrous when young and old, lemon-scented when crushed; midrib sunken or flat, above glabrous when young and old, below glabrous to pubescent at base when young and old; secondary veins 8 to 14 pairs per side, tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 2 per inflorescence; pedicel 0-6 mm long, 2-3 mm in diameter, densely pubescent; in fruit ca. 5 mm long, ca. 3.5 mm in diameter; bracts 2 to 6, several basal and one upper towards the middle of pedicel, basal bracts 2-3 mm long, 1-3 mm wide; upper bract 6-11 mm long, 9-15 mm wide; sepals 3, valvate, basally fused, imbricate at the middle, 9-13 mm long, 9-13 mm wide, ovate, apex acuminate, base truncate, densely pubescent outside, glabrous inside, margins flat; petals free, sub equal; outer petals 3, 15-21 mm long, 9-15 mm wide, ovate, apex acuminate, base truncate, margins flat, densely pubescent outside, glabrous inside; inner petals 3, valvate, 15-22 mm long, 5-10 mm wide, ovate, apex acuminate, base truncate, margins flat, densely pubescent outside, glabrous inside; stamens 200 to 300, in 10 to 15 rows, 3-3.5 mm long, narrowly oblong; connective discoid; staminodes absent; carpels free, 7 to 30, ovary 3.5-4.5 mm long, stigma bilobed, slightly capitate, densely pubescent. Monocarps shortly stipitate, stipes 1-3 mm long, ca. 3 mm in diameter; monocarps 2 to 10, 23-40 mm long, 17-30 mm in diameter, ellipsoid to globose, yellow when ripe emitting strong lemon smell; seeds 9 to 18 per monocarp, 21-28 mm long, ca. 10 mm in diameter, ellipsoid to oblong; aril absent. Distribution. A species with a disjunct distribution in West Africa (Ghana, Ivory Coast) and Central Africa (Nigeria, Cameroon); in Cameroon, known from the South-West region. Habitat. A rare species, only collected five times in Cameroon, the last collection from 1987. In lowland primary or secondary rain forest. Altitude 200-400 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not evaluated. Uses in Cameroon. None reported. Notes. Uvariodendron angustifolium is distinguished by its narrowly elliptic and relatively small leaves (13-16 cm versus > 16 cm) compared to the other species in Cameroon. Two collections, Thomas 6087 & 7018, record that this species emits a strong-lemon scent from the leaves when fresh, which is also recorded in Uvariodendron molundense var. citrata Le Thomas, a variety endemic to Gabon (Le Thomas 1969b) and in Uvariopsis citrata Couvreur & Niangadouma (Couvreur and Niangadouma 2016). Specimens examined. South-West Region: Between Bafia and Likoko, 4.37°N, 9.324°E, 05 February 1958, Keay R.W.J. 37524 (K); Kumba, 4.63°N, 9.416°E, 1896, Staudt A. 642 (K); Johann-Albrechtshöhe [Kumba] area 4.16°N, 9.2°E, 28 March 1896, Staudt A. 742 (B,K); Lake Barombi Kumba, 4.64°N, 9.45°E, 01 April 1986, Thomas D.W. 6087 (YA); Along the road between Konye and Bakole, 4.91°N, 9.466°E, 25 May 1987, Thomas D.W. 7018 (YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 385-387, DOI: 10.3897/phytokeys.207.61432, {"references":["Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371","Couvreur, TLP, Niangadouma, R, 2016. New species of Uvariopsis (Annonaceae) and Laccosperma (Arecaceae / Palmae) from Monts de Cristal, Gabon. PhytoKeys 68: 1 - 8, DOI: https://doi.org/10.3897/phytokeys.68.9576"]}

Uvaria angolensis Welw. ex Oliv., Fl. Trop. Afr. 1: 23, 1868 Figs 103, 113; Map 13A = Uvaria bukobensis Engl., Pflanzenw. Ost-Afrikas C: 178, 1895. Type. Tanzania: Kagera region, Bukoba, Stuhlmann F.L. 1132, no date: lectotype, here designated: K[K000198760]. = Uvaria angolensis var. guineense Keay, Kew Bull. 8: 71, 1953. Type. Cameroon. Kunde, Mildbraed G.W.J. 9224, 3 May 1914: holotype: K[K000198772]. = Uvaria variabilis De Wild., Pl. Bequaert. I: 461, 1922. Type. Democratic Republic of the Congo. Orientale, bord de la Semliki, Lesse, Bequaert J. 4117, 7 May 1914: lectotype, sheet here designated: BR[BR0000009826274]; isotypes: BR[BR0000009826601]; K[K000198773]. Type. Angola. Malanje; Pungo Andongo, Welwitsch F.M.J. 754, Apr 1857: lectotype, sheet here designated: LISU[LISU206054]; isotypes: B[B 10 0153065]; BM[BM000554044]; COI[COI00004859]; K[K000198826]; P[P00046766]; LISU[LISU206055]. Description. Liana, 2-6 m tall, d.b.h. unknown. Indumentum of mixed simple, fasciculate or stellate hairs; old leafless branches sparsely pubescent, young foliate branches densely to sparsely pubescent. Leaves: petiole 3-10 mm long, 2 mm in diameter, tomentose to very sparsely pubescent, cylindrical, blade inserted on the side of the petiole; blade 4-17 cm long, 2.5-7 cm wide, oblong to elliptic, apex acuminate, acumen 1-1.5 cm long, base rounded to subcordate, subcoriaceous, below densely to sparsely pubescent when young and old, above sparsely pubescent when young, sparsely pubescent to glabrous when old; midrib sunken or flat, above densely pubescent when young, densely to sparsely pubescent when old, below sparsely pubescent when young, densely to sparsely pubescent when old; secondary veins 6 to 12 pairs, pubescent above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young or old foliate branches, extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 3 per inflorescence; pedicel 4-6 mm long, 1-2 mm in diameter, pubescent; in fruit 7-10 mm long, 2 mm in diameter, tomentose; bracts 2, one basal and one towards the lower half of pedicel, basal bract 1-2 mm long, 1 mm wide; upper bract 2-3 mm long, 4-5 mm wide; sepals 3, valvate, completely fused, tearing at anthesis, 5-9 mm long, 4-7 mm wide, ovate, apex truncate, base truncate, green to yellow, tomentose outside, tomentose inside, margins flat; petals free, sub equal; outer petals 3, 12-20 mm long, 8-11 mm wide, ovate to obovate, apex obtuse, base truncate, green to yellow, margins flat, pubescent outside, pubescent inside; inner petals 3, imbricate, 12-19 mm long, 8-11 mm wide, obovate to ovate, apex rounded, base truncate, green to yellow, margins flat, pubescent outside, tomentose inside; stamens 190 to 210, in 8 to 9 rows, 3-5 mm long, linear; connective tongue shaped, pubescent, yellow to orange; staminodes absent; carpels free, 25 to 35, ovary 4-5 mm long, stigma bilobed, slightly capitate, glabrous. Monocarps stipitate, stipes 8-12 mm long, 2-5 mm in diameter, inserted laterally; monocarps ca. 20, 13-40 mm long, 6-20 mm in diameter, cylindrical, apex apiculate, tomentose, smooth and slightly constricted around the seeds, brown turning red when ripe; seeds 6 to 16 per monocarp, ca. 10 mm long, 4-5 mm in diameter, ellipsoid; aril absent. Distribution. A widespread tropical African species, occurring from Sierra Leone to Central African Republic, Sudan and Ethiopia, and from Kenya to Zambia, one of the few Annonaceae species with such a wide continental distribution (Couvreur et al. 2008a); in Cameroon known from the Adamaoua, Central, East, North-west, South and West regions. Habitat. A common species in Cameroon; mainly occurring in gallery forests in drier regions of the country but also in rain forests. Altitude 500-1400 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Botanic Gardens Conservation International and IUCN SSC Global Tree Specialist Group 2019c). Uses in Cameroon. None reported. Notes. Uvaria angolensis belongs to a complex of species characterized by a calyx completely fused in bud and tearing into three distinct sepals at anthesis (Verdcourt 1971b). In Cameroon, other species of Uvaria with that character are U. baumannii, U. chamae, and U. osmantha. These species are all quite close morphologically (although U. baumanii and U. osmantha are quite different) but can be differentiated by some distinctive characters in particular fruit shape (see Key). Uvaria angolensis is particularly close to U. versicolor (not in Cameroon), but is distinguished by the connective of the stamens being tongue shaped versus discoid in U. versicolor. Uvaria angolensis is also quite variable in its indumentum varying from densely pubescent to glabrous. Specimens examined. Adamaoua Region: Réserve forestière de Ngaoundéré, 7.32°N, 13.58°E, 21 July 1977, Fotius G. 2738 (P,YA); Beleldibi (35 km au SSE de Ngaoundéré), 7.32°N, 13.58°E, 22 July 1966, Letouzey R. 7486 (P,YA); Pentes NO de l’Hoséré Banyo entre 1100 et 1400 m, 6.75°N, 11.82°E, 09 June 1967, Letouzey R. 8565 (L,YA). Central Region: Yaoundé Mt Eloumden path from foot of mountain (ca 800 m) on Mendong side, 3.81°N, 11.43°E, 02 May 1996, Cheek M. 8307 (K,WAG,YA); Pentes orientales du mont Yangba (1473 m) près Nyafianga (42 km NNE de Bafia), 5.13°N, 11.35°E, 09 September 1966, Letouzey R. 7829 (P,YA); Près Nyafianga à 46 km SW de Linté, 5.13°N, 11.35°E, 23 April 1982, Nkongmeneck B.A. 310 (P,YA). East Region: Kumbe, 6°N, 14.30°E, 01 January 1914, Mildbraed G.W.J. 9224 (COI,K). North Region: Wakwa, 7.23°N, 13.58°E, 07 October 1960, Breteler F.J. 432 (WAG); Near craterlake ' Lac Tison’ ca 12 km SE of Ngaoundéré, 7.25°N, 13.58°E, 30 November 1964, de Wilde W.J.J.O 4361 (WAG). South Region: Rocher de Ako’okas 26 km southeast of Ebolowa, 2.7°N, 11.28°E, 21 February 1987, Huber H.F.J. 982 (YA). West Region: ca. 6 km NE of Bangangte, 5.15°N, 10.52°E, 11 May 1964, de Wilde J.J.F.E 2579 (B,BR,K,MO,P,WAG,YA); Mme Vilatte plantations caOca 5 km from Foumbot, 5.55°N, 10.61°E, 07 July 1972, Leeuwenberg A.J.M. 10160 (BR,K,MO,P,WAG,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 331-334, DOI: 10.3897/phytokeys.207.61432, {"references":["Couvreur, TLP, Chatrou, LW, Sosef, MS, Richardson, JE, 2008a. Molecular phylogenetics reveal multiple tertiary vicariance origins of the African rain forest trees. BMC Biology 6: e54. https://doi.org/10.1186/1741-7007-6-54","Verdcourt, B, 1971b. Notes on African Annonaceae. Kew Bulletin 25: 1 - 24, DOI: https://doi.org/10.2307/4103132"]}

Annickia Setten & Maas, Taxon 39 (4): 676, 1990 = Enantia Oliv. nom. illeg.; J. Linn. Soc., Bot. 9: 174-175, 1867. Type species. Enantia chlorantha Oliv. (≡ Annickia chlorantha (Oliv.) Setten & Maas). Description. Trees, up to 30 m tall, d.b.h. up to 50 cm; stilt roots or buttresses absent, slash yellow. Indumentum of simple, stellate and/or fasciculate hairs. Leaves: petiole 2-9 mm long, 1-2 mm in diameter; blade 3.5-29.5 cm long, 1.5-10.5 cm wide, elliptic to obovate, apex acuminate to acute, base narrowly cuneate to shortly attenuate to rounded; midrib sunken or flat; secondary veins 8 to 13 pairs; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, leaf opposed or extra axillary. Flowers with 6 perianth parts in 2 whorls, 1 per inflorescence; pedicel 4-19 mm long; in fruit 10-27 mm long; bracts 1 to 2, basal and one upper towards the middle or lower half of pedicel, 2-8 mm long; sepals 3, valvate, free, 5-22 mm long, triangular, apex acute, base truncate; petals free; outer petals absent; inner petals 3, valvate, 12-34 mm long, 5-19 mm wide, ovate, margins inversely Y-shaped ridged, apex acute, base broad and concave; stamens 60 to 200, in 5 to 6 rows, 2-4 mm long, linear; connective tongue shaped or flattened, glabrous; staminodes absent; carpels free, 20 to 70, ovary 2-4 mm long, stigma lobed or cylindrical, pubescent. Monocarps stipitate, stipes 6-59 mm long, 5 to 55 monocarps, 18-35 mm long, 4-14 mm in diameter, ellipsoid to obovoid, apex sometimes mucronate, smooth, glossy; seed 1, 20-30 mm long, ca. 10 mm in diameter, ellipsoid; aril absent. A genus of eight species mostly distributed across west and central Africa, with one endemic species in Tanzania; four species occur in Cameroon, none endemic. The genus is easily identifiable when sterile by its yellow slash, and when fertile, by its leaf opposed or extra-axillary (terminal) flowers with 3 sepals and 3 petals, and stipitate monocarps with a single seed. Taxonomy. Versteegh and Sosef (2007)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on page 30, DOI: 10.3897/phytokeys.207.61432, {"references":["Versteegh, PC, Sosef, MSM, 2007. Revision of the African genus Annickia (Annonaceae). Systematics and Geography of Plants 77 (1): 91 - 118, https://www.jstor.org/stable/20649730"]}

Piptostigma macranthum Mildbr. & Diels, Bot. Jahrb. Syst. 53(1-2): 142, 1915 Figs 88, 89; Map 11D = Piptostigma mayumbense Exell, J. Bot. 64 (Suppl. 1): 10, 1926. Type. Angola. Cabinda, M’bulu hills, Mayumbe, Gossweiler J. 7807, 15 Feb 1919: holotype: B[B100460898]. Type. Cameroon. South Region; Mimfia (Bipindi), Zenker G.A. 2528, 1902: holotype: B[B100154080]; isotypes:[BR0000013174743]; G[G00442261]; K[K000199001]; P[P00363281, P00363282, P00363283]; S[S07-13471]. Description. Tree, 6-18 m tall, d.b.h. 15-21 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 2-3 mm long, 2-3 mm in diameter, pubescent, cylindrical, blade inserted on top of the petiole; blade 14-31 cm long, 7-9 cm wide, ovate to oblong, apex acuminate, acumen 0.5 cm long, base rounded to cordate, subcoriaceous, below pubescent when young and old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above pubescent when young and old, below densely pubescent when young, densely pubescent when old; secondary veins 16 to 30 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous, pubescent all over, peduncle like base 6-25 mm long, axial internodes 10-20 mm long, compact to sub-lax, sympodial rachis 10-70 mm long. Flowers with 9 perianth parts in 3 whorls, 2 to 4 per inflorescence; pedicel 5-20 mm long, 3-5 mm in diameter, tomentose; in fruit 20-25 mm long, ca. 6 mm in diameter, pubescent; basal bract ca. 10 mm long, ca. 10 mm wide; upper bract ca. 10 mm long, ca. 10 mm wide; sepals 3, valvate, free, ca. 9 mm long, ca. 8 mm wide, triangular, apex acute, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, 12-28 mm long, 9-11 mm wide, obovate, apex acute, base truncate, wine-brown, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 40-55 mm long, 10-20 mm wide, elliptic, apex acute, base truncate, cream, margins wavy, pubescent outside, pubescent inside; stamens 280 to 320, in 10 to 11 rows, 1-2 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 9 to 12, ovary ca. 2 mm long, stigma globose, pubescent. Monocarps sessile, 3 to 6, 30-40 mm long, 25-40 mm in diameter, obovoid, apex acute, pubescent, muricate with projections up to 10 mm long, not ribbed, projections brown otherwise reddish when mature; seeds 2 to 6 per monocarp, ca. 10 mm long, ca. 5 mm in diameter, ellipsoid; aril absent. Distribution. From Cameroon to the Republic of Congo; in Cameroon known from the South and Central regions. Habitat. A rare species in Cameroon; in forest edges or in closed forests along rivers. Altitude 50-500 m a.s.l. Local and common names known in Cameroon. Nom-owé (Dial. Yaoundé, Letouzey s.n.). IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019a k). Uses in Cameroon. None reported. Notes. Piptostigma macranthum is easily distinguished from other species of Piptostigma by its characteristic narrowly oblong to oblong leaf blade shape, shiny upper side of leaf blade, rounded and cordate leaf blade base and thick compact inflorescences. Specimens examined. Central Region: Ca 50 km S of Badjob ca 60 km SW of Eséka, 3.46°N, 10.5°E, 19 March 1964, de Wilde W.J.J.O 2132 (BR,P,WAG); Akomimbang (Mbalmayo), 3.52°N, 11.5°E, 13 November 1957, Letouzey R. 1937 (P); Akomimbang Mbalmayo, 3.52°N, 11.5°E, 13 November 1957, Letouzey R. s.n. (P,YA). South Region: 10 km From Kribi Lolodorf road, 2.98°N, 9.966°E, 27 May 1969, Bos J.J. 4647 (BR,K,MO,P,U,WAG,YA); Bezirk Kribi Vorland mit einzeln Hügeln bei Adjab 25 km Grand batanga near Eduma and Bidue, 2.93°N, 9.92°E, 25 July 1911, Mildbraed G.W.J. 6118 (HBG); 51 SE de Campo Nkolmenbegue, 2.39°N, 10.3°E, 24 November 1992, Satabié B. 1037 (YA); Efoulan, 2.74°N, 10.54°E, 04 December 2000, Tchouto Mbatchou G.P. 3100 (KRIBI,WAG,YA); Bipindi, 3.08°N, 10.42°E, 01 January 1903, Zenker G.A. 2528 (B,BR,G,L,P,WAG); Bipindi, 3.08°N, 10.42°E, 01 May 1902, Zenker G.A. s.n. (P)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 291-293, DOI: 10.3897/phytokeys.207.61432, {"references":["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019a. Annickia affinis. The IUCN Red List of Threatened Species: e.T132512369A132513599. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132512369A132513599.en"]}

Brieya fasciculata De Wild., Repert. Spec. Nov. Regni Veg. 13: 384, 1914 Figs 19, 20; Map 3B ≡ Piptostigma fasciculatum (De Wild.) Boutique ex Fries, In Engler A., Prantl K. (eds) Die Natürlichen Pflanzenfamilien 17aII: 115-116, 1959. = Piptostigma aubrevillei Ghesq. ex. Aubrév.; Fl. For. Cote d’Ivoire 1: 98, 1936. Type. Ivory Coast. Mudjika, Aubréville A. 2115, 1932: lectotype, designated by Ghogue et al. (2017), p. 211: P[P02032149]. Type. Democratic Republic of the Congo. Bas-Congo; Kingamu, Ganda sumi, de Briey J. 66, 14-16 Oct 1911: lectotype, sheet here designated: BR[BR-S.P.880319]; isotypes: BR[BR0000008803252, BR0000008803245, BR0000008803191]. Description. Tree, 10-25 m tall, d.b.h. 16-50 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 2-5 mm long, ca. 2 mm in diameter, pubescent, grooved, blade inserted on top of the petiole; blade 12-24 cm long, 6-8 cm wide, obovate to oblanceolate, apex acuminate to obtuse, acumen 0.5-0.8 cm long, base cordate to obtuse, papyraceous, below glabrous to pubescent when young, glabrous to pubescent when old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above pubescent when young and old, below pubescent when young and old; secondary veins 11 to 17 pairs, glabrous below; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on old leafless branches, axillary occurring on short peduncle-like bases 0-2 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 4 per inflorescence; pedicel 1-2 mm long, ca. 5 mm in diameter, pubescent; in fruit 15-25 mm long, 4-5 mm in diameter, glabrous; bracts 2, one basal and one upper towards the lower half of pedicel, basal bract 2-3 mm long, ca. 2 mm wide; upper bract ca. 1 mm long, ca. 2 mm wide; sepals 3, valvate, free, ca. 2 mm long, ca. 2 mm wide, ovate, apex acute, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, sepal like, 1.5-2 mm long, 1.5 mm wide, ovate, apex acuminate, base truncate, light green, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 38-108 mm long, 3-7 mm wide, linear, apex acute, base truncate, green, margins flat, pubescent inside, pubescent outside; stamens 30 to 40, in 4 to 5 rows, ca. 1 mm long, broad; connective discoid, glabrous, green; staminodes absent; carpels free, ca. 4, ovary ca. 2 mm long, stigma minute, densely pubescent. Monocarps sessile, 1 to 3, 42-46 mm long, 25-40 mm in diameter, ellipsoid, apex rounded, glabrous, smooth, fleshy, green when ripe; seeds 18 to 20 per monocarp, ca. 10 mm long, ca. 4 mm in diameter, ellipsoid; aril absent. Distribution. From Côte d’Ivoire to Democratic Republic of the Congo and Angola; in Cameroon known from East, South, Centre, Littoral and South-West regions. Habitat. A common species when present, in lowland to submontane rain forests in primary or secondary habitats. Altitude 250-810 m a.s.l. Local and common names known in Cameroon. baouéfou à grandes feuilles (french) (Burkill 1985). IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019e). Uses in Cameroon. None recorded. Notes. Brieya fasciculata is distinguished by its discolorous leaves, glaucous white below with a percurrent tertiary venation, its flowers occurring on reduced inflorescences with a short peduncle, the inner petals much longer than the outer ones, with the minute sepals and outer petals identical is shape and size, and its long green linear inner petals. Specimens examined. Central Region: Près Ngong (25 km NE d’Edéa), 3.75°N, 10.98°E, 12 December 1973, Letouzey R. 12345 (P,YA). East Region: 68 km south of Yokadouma 30 km after Ngato 15 km after river ALPICAM 'base de vie’ then 40 km on forestry road starting 4 km before Maséa village, 3.08°N, 14.66°E, 08 March 2019, Couvreur T.L.P. 1231 (MPU,WAG,YA); Batéka Malen 20 km NE de Moloundou, 2.15°N, 15.35°E, 23 April 1971, Letouzey R. 10718 (P,YA); Entre Asip et Mang (60 km ENE de Lomié), 3.4°N, 14.17°E, 13 August 1963, Letouzey R. 5605 (P,YA). North-West Region: Kagwene, 6.10°N, 9.744°E, 13 June 2009, Ashworth J. 310 (K,YA). South Region: Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.48°N, 10.34°E, 11 February 2015, Couvreur T.L.P. 677 (WAG,YA); Abords de la Lobé à 50 km au SSE de Kribi et à 30 km à l’ENE de Campo, 2.51°N, 9.82°E, 23 March 1968, Letouzey R. 9132 (YA). South-West Region: Mudjika (Wudjika?), 4.29°N, 9.41°E, 01 January 1933, Aubréville A. 2115 (P); on trail from Ekongo village located 5 km before the entrance to Limbe 7 km on secondary road On flank of Mt Etinde 100 m in Mont Cameroon National Park, 4.07°N, 9.132°E, 16 October 2013, Couvreur T.L.P. 510 (WAG,YA); on trail from Ekongo village located 5 km before the entrance to Limbe 7 km on secondary road On flank of Mt Etinde 100 m in Mont Cameroon National Park, 4.07°N, 9.131°E, 16 October 2013, Couvreur T.L.P. 511 (WAG,YA); Rumpi mountains forest trail ca 5 km after Dikome Balue village ca 40 km north of Kumba, 4.93°N, 9.240°E, 10 January 2016, Couvreur T.L.P. 957 (WAG,YA); Kupe village Muanezum trail = Daniel Ajang’s Earthwatch rented area Mt 4.76°N, 9.666°E, 28 March 1996, Etuge M. 1844 (K); Kupe village, 4.77°N, 9.688°E, 28 November 1999, Gosline W.G. 234 (K); Njonji, 4.11°N, 9.016°E, 21 April 1997, Nning J. 385 (K,YA); Cameroon Mountain, 4.12°N, 9.028°E, 20 June 2001, van Andel T.R. 3732 (U,WAG)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 82-85, DOI: 10.3897/phytokeys.207.61432, {"references":["Ghogue, J-P, Sonke, B, Couvreur, TLP, 2017. Taxonomic revision of the African genera Brieya and Piptostigma (Annonaceae). Plant Ecology and Evolution 150: 173 - 216, DOI: https://doi.org/10.5091/plecevo.2017.1137","Burkill, HM, 1985. The useful plants of West tropical Africa Vol. 4. 2nd ed. Royal Botanic Gardens Kew, Kew","Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019e. Brieya fasciculata. The IUCN Red List of Threatened Species: e.T132515863A132516629. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132515863A132516629.en","Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371"]}

Monanthotaxis glaucifolia (Hutch. & Dalziel) P.H.Hoekstra, Taxon 66: 14, 2017 Map 7H ≡ Oxymitra glaucifolia Hutch. & Dalziel, Kew Bull.: 153, 1927; Richella glaucifolia (Hutch. & Dalziel) R.E.Fr., Nat. Pflanzenfam., ed. 2, 17a (2): 139, 1959; Friesodielsia glaucifolia (Hutch. & Dalziel) Steenis, Blumea 12: 359, 1964. Type. Nigeria. Cross River State; Oban, Talbot P.A. 403, 1911: holotype: BM[BM000843988]. Description. Liana, height unknown, d.b.h. unknown. Indumentum of simple hairs; old leafless branches pubescent to glabrescent, young foliate branches densely pubescent with dense appressed to ascending light-brown hairs 0.2-0.5 mm long. Leaves: petiole 4-7 mm long, 2-3 mm in diameter, densely pubescent with light-brown hairs, slightly grooved, blade inserted on top of the petiole; blade 11-25.8 cm long, 3.7-8.6 cm wide, oblong to obovate, apex acuminate, acumen 0.5-2.5 cm long, base subcordate, subcoriaceous to membranous, below sparsely pubescent when young and old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below sparsely pubescent when young, glabrous when old; secondary veins 10 to 13 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on old leafless branches, leaf opposed to extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 5-21 mm long, ca. 1 mm in diameter, densely pubescent; in fruit 5-21 mm long, 2 mm in diameter; upper bract ca. 3 mm long, ca. 2 mm wide; sepals 3, valvate, free, ca. 5 mm long, ca. 7 mm wide, ovate, apex obtuse, base truncate, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner, inner petals entirely covered in bud; outer petals 3, 30-35 mm long, 23-25 mm wide, ovate, apex, base truncate, margins flat, pubescent outside, sparsely pubescent to glabrous inside; inner petals 3, valvate, ca. 21 mm long, ca. 26 mm wide, rhombic, apex acute, base truncate, margins flat, pubescent outside, glabrous inside; stamens 100 to 150, in 5 to 6 rows, ca. 1 mm long, cuneate; connective truncate, glabrous; staminodes absent; carpels free, 45 to 50, ovary ca. 2 mm long, stigma globose, glabrous. Monocarps stipitate, stipes 3-4 mm long, ca. 2 mm in diameter; monocarps ca. 8, 15-26 mm long, 9-10 mm in diameter, ellipsoid, apex rounded to apiculate, pubescent, smooth, constricted around seeds when more than 1, color unknown; seeds 1 to 2 per monocarp, ca. 10 mm long, ca. 8 mm in diameter, ellipsoid; aril absent. Distribution. Known from Nigeria and Cameroon; in Cameroon known from the South-West region. Habitat. A rare species, in submontane primary forest. Altitude 950 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Endangered (EN) (Hoekstra et al. 2021). Uses in Cameroon. None reported. Notes. Monanthotaxis glaucifolia resembles M. dielsiana and M. enghiana by the shape of its leaves (oblong to obovate) and the largish flowers. It differs from M. dielsiana by having more than 100 stamens per flower, and by light brown hairs on the young foliate branches, while M. dielsiana has orange-brown hairs and about 65 stamens per flower. Monanthotaxis enghiana differs from M. glaucifolia by its densely pubescent branches and leaves with long erect hairs; furthermore, M. enghiana generally has 2 to 5 flowers per inflorescence and M. glaucifolia only one. It is possible that M. enghiana and M. glaucifolia are synonymous, and Hoekstra et al. (2021) suggested that the latter could merely be a higher altitude variant of the former. However for now, both species are retained before more detailed studies are done (Hoekstra et al. 2021). Specimens examined. South-West Region: Mount 4.78°N, 9.683°E, 26 November 1999, Cheek M. 10154 (K,MO,WAG,YA); AyinKeh 3 km north of Ngomboku, 4.93°N, 9.731°E, 17 December 1999, Ghogue J.-P. 500 (K,P,WAG,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 205-206, DOI: 10.3897/phytokeys.207.61432, {"references":["Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01"]}

Neostenanthera Exell, J. Bot. 73 (Suppl.): 5, 1935 = Stenanthera Engl. & Diels, Notizbl. Königl. Bot. Gart. Berlin 3: 57, 1900; Oxymitra sect. Stenanthera Oliv., Fl. Trop. Afr. 1: 32. 1868. Type species. Oxymitra hamata Benth. (= Neostenanthera hamata (Benth.) Exell). Description. Trees to shrubs, 3 - 25 m tall, d.b.h. 3-30 cm; stilt roots or buttresses absent. Indumentum of simple hairs. Leaves: petiole 2-14 mm long, 1-3 mm in diameter; blade 6-31 cm long, 2-10 cm wide, ovate or elliptic or oblong, apex acuminate or acute, acumen 0.5-2.4 cm long, base rounded or obtuse or cuneate, discolorous, whitish below or concolorous; midrib sunken or flat; secondary veins 10 to 24 pairs; tertiary venation percurrent. Individuals bisexual; inflorescences cauliflorous or ramiflorous on old leafless branches, leaf opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 8 per inflorescence; pedicel 5-46 mm long, ca. 1 mm in diameter; in fruit 20-60 mm long, 2-4 mm in diameter; bract 1, basal, 1-3 mm long, ca. 1 mm wide; sepals 3, valvate, free, 1-4 mm long, 1-3 mm wide, triangular or ovate or semi-circular, apex acute or acuminate, base truncate; petals free, valvate, outer petals longer than inner; outer petals 3, 6-33 mm long, 1-15 mm wide, elliptic or narrowly triangular, apex acute or attenuate, base narrowed and concave; inner petals 3, valvate, 1-10 mm long, 0.6-5 mm wide, triangular, apex acute, base broad and concave; stamens 30 to 170, in 4 to 6 rows, 2-3 mm long, linear or broad; connective tongue-shaped; staminodes absent; carpels free, 20 to 109, ovary 1-2.5 mm long, stigma cylindrical or filiform. Monocarps sessile or stipitate, stipes 6-23 mm long; monocarps 7 to 144, 10-30 mm long, 10-20 mm in diameter, ellipsoid, apex apiculate, rounded or pyramidal in shape; seed 1, 4-14 mm long, 2-11 mm in diameter, ellipsoid; aril absent. Taxonomy. Fero et al. (2014) [in part]; Le Thomas (1965b). A widespread genus with five species (including Boutiquea platypetala, see under N. neurosericea), three species known from Cameroon, none endemic (the name Boutiquea platypetala is placed in synonymy with N. neurosericea see below). When sterile, this genus can be confused with Monanthotaxis both being lianas with a whitish lower side of leaf blade and percurrent tertiary venation. They are however unmistakable when in flower or fruit. Neostenanthera gabonensis occurs in Gabon and West Africa (Fero et al. 2014). To date it has not been collected from Cameroon as far as we know, but likely does occur there. We have added this species to the key., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on page 265, DOI: 10.3897/phytokeys.207.61432, {"references":["Fero, M, Aedo, C, Cabezas, F, Velayos, M, 2014. Taxonomic revision of Neostenanthera (Annonaceae). Systematic Botany 39: 17 - 30, DOI: https://doi.org/10.1600/036364414X678071","Le Thomas, A, 1965b. Un nouveau genre africain d'Annonacees: Boutiquea Le Thomas. Adansonia 5: 531 - 535"]}

Duguetia confinis (Engl. & Diels) Chatrou, Changing Genera: 67, 1998 Figs 25, 26; Map 3I ≡ Pachypodanthium confine Engl. & Diels, Notizbl. Konigl. Bot. Gart. Berlin 3: 55, 1900. = Pachypodanthium sargosii R.E.Fr., Ark. Bot. 3(2): 38, 1955; Pachypodanthium confine var. sargosii Le Thomas, Fl. Gabon 16: 106, 1969. Type. Republic of Congo: Kouilou, Sargos R. 29, 4 Mar 1920: lectotype, sheet here designated: P[P00364784]; isotype: P[P00364785]. Type. Gabon. Estuaire; Libreville, Klaine T.-J. 217, 10 Oct 1895: lectotype, sheet here designated: P[P00315819]; isotypes: P[P00315821, P00315815]. Description. Tree, 15-40 m tall, d.b.h. 40-85 cm; stilt roots or buttresses absent. Indumentum of stellate hairs; old leafless branches sparsely pubescent to glabrous, young foliate branches densely pubescent. Leaves: petiole 1-8 mm long, 2-6 mm in diameter, densely pubescent, cylindrical, blade inserted on the side of the petiole; blade 9-31 cm long, 3-8 cm wide, elliptic, apex acute, acumen 0.5-1 cm long, base rounded to acute, coriaceous, below densely pubescent with white erect stellate hairs covering the whole blade when young and old, above glabrous when young and old, discolorous, whitish below; midrib sunken or flat, above glabrous when young and old, below densely pubescent when young and old; secondary veins 14 to 25 pairs, indistinct, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old leafless branches, appearing axillary, forming on a short peduncle 2-11 mm long. Flowers with 9 perianth parts in 3 whorls, 2 to 5 per inflorescence; pedicel 3-20 mm long, 2-5 mm in diameter, densely pubescent; in fruit 3-20 mm long, 2-5 mm in diameter, glabrous to densely pubescent; bracts 2, one basal and one towards the upper half of pedicel, basal bracts 5-9 mm long, 5-10 mm wide; sepals 3, valvate, free, 17-22 mm long, 13-15 mm wide, ovate, apex acute, base truncate, green, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner to sub equal; outer petals 3, 11-18 mm long, 5-9 mm wide, elliptic, apex acuminate, base truncate, cream to white, margins wavy, densely pubescent outside, glabrous inside; inner petals 3, imbricate, 11-18 mm long, 5-9 mm wide, elliptic, apex acuminate, base truncate, cream, margins flat, pubescent outside, glabrous inside; stamens 290 to 310, in 7 to 8 rows, 1-2 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 100 to 125, ovary 1.4-2 mm long, stigma globose, glabrous. Fruit pseudosyncarpous, 25-50 mm in diameter, ellipsoid; individual carpels sessile, 100 to 125 carpels, completely fused, 15-12 mm long, 2-5 mm in diameter, obovoid, apex apiculate to acute, densely pubescent, longitudinally ribbed with 5 to 6 main ribs, greyish brown with purplish red or pale brown pulp when ripe; seed 1 per monocarp, 10-14 mm long, 4-8 mm in diameter, ellipsoid; aril present, red. Distribution. From Cameroon to Gabon and Republic of Congo; in Cameroon known from East, South and Littoral regions. Habitat. In lowland periodically inundated or non-inundated rain forests. Altitude 0-50 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019j). Uses in Cameroon. None recorded. Notes. Duguetia confinis is distinguished by its lower leaf surface, which is densely pubescent with erect stellate hairs completely covering the blade, and its carpels completely fused in fruit. Specimens examined. Central Region: Est N of Lom near Sanaga river (Yaundé) 250 km from Deng Deng, 4.84°N, 13.19°E, 01 March 1914, Mildbraed G.W.J. 8558 (K). Littoral Region: Au sud de Ngola (8 km E de l’embouchure de la Sanaga), 3.55°N, 9.698°E, 05 January 1974, Letouzey R. 12585 (P); Douala-Edea Reserve 10B, 5.01°N, 13.33°E, 01 April 1978, Thomas D.W. 1237 (K). South Region: ca 16 km from Kribi Ebolowa road Bidou plantation Kienke forReserve, 2.85°N, 10.01°E, 03 February 1969, Bos J.J. 3844 (WAG,YA); 20 km From Kribi N of Lolodorf road (SFIA logging road), 3.01°N, 10.05°E, 15 July 1969, Bos J.J. 5048 (BR,BR,K,WAG,YA); Mt Elephant ca 18 km SE of Kribi, 2.78°N, 10.5°E, 14 January 1970, Bos J.J. 6128 (BR,P,WAG); Near mouth of, 3.17°N, 9.961°E, 28 March 1928, Hédin L. 1690 (P,WAG); Campo-Ma’an area 2.71°N, 9.866°E, 26 October 2001, van Andel T.R. 4205 (KRIBI,WAG); Bipindi, 3.08°N, 10.42°E, 01 January 1904, Zenker G.A. 3195 (B,BR,E,G,L,M,MO,P,S)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 103-104, DOI: 10.3897/phytokeys.207.61432, {"references":["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019j. Duguetia confinis. The IUCN Red List of Threatened Species: e.T61984644A61984646. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T61984644A61984646.en","Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371"]}

Xylopia monticola D. M. Johnson & N. A. Murray, PhytoKeys 97: 190-193. 2018 Map 18E Type. Nigeria. Taraba [" N. E. State "] State, Sardauna Province, Kurmin Kugapa, below Kurmin Dodo below the western edge of Cabbal Wade ["Chappal Waddi"], ca. 5500 ft, 28 Feb 1975, Chapman J.D. 3755 Holotype: K. Description. Tree up to 10 m (-20 m) tall, d.b.h. unknown; stilt roots and buttresses absent. Old branches glabrate, young branches pubescent with erect dull gray to brown hairs 0.1-1.2 mm long. Leaves: petiole 3.5-9 mm long, pubescent, grooved; blades 7.8-10.9 cm long, 2.7-5.1 cm wide, lanceolate, lanceolate-oblong, elliptic to oblong or oblong-oblanceolate, apex blunt-acuminate, acumen 0.4-1.6 cm long, base broadly cuneate to nearly rounded, papyraceous to subcoriaceous, below sparsely pubescent to glabrate, above glabrous, concolorous; midrib flat, above pubescent, below pubescent; secondary veins 7-13 pairs; tertiary venation conspicuously reticulate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, axillary, peduncle absent. Flowers with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 5.2-8.1 mm long, 1-1.3 mm in diameter; in fruit 6-8.7 mm long, 1.5-2.8 mm thick, sparsely pubescent, sometimes with bracts or sepals persistent; bracts 3-4, evenly spaced, 2-3.1 mm long, ovate; sepals 3, valvate, basally fused, 2.7-3.5 mm long, 2.9-3.1 mm wide, triangu-lar to ovate, apex acute, pubescent outside; outer petals 3, (15-) 36-52 mm long, 2.7-3.6 mm wide at base, linear, apex acute, base concave, cream, pubescent inside, sericeous outside; inner petals 3, valvate, (15.5-) 29-37 mm long, 2-2.6 mm wide at base, linear, apex obtuse, base concave, cream, pubescent on both surfaces except for glabrous base; stamens 160-200, 1.8-2.2 mm long, narrowly oblong, connective apex shield-like, glabrous; carpels 7 to 8, ovary 1.2-1.3 mm long, stigma loosely connivent, linear, 2-3.4 mm long, glabrous except for apical hair tuft. Monocarps stipitate, stipe 8-13 mm long, 2.1-2.6 mm in diameter, monocarps 4 to 8, 34-40 mm long, 6-10 mm wide, narrowly oblong and slightly falciform, torulose, apex obtuse or with a beak 0.5-2 mm long, glabrate, verrucose, green outside, endocarp red; seeds up to 5 per monocarp, in a single row, 11-13.1 mm long, 5.8-6.5 mm wide, oblongoid; sarcotesta "glaucous “glaucous”; aril absent. Distribution. Easternmost Nigeria and adjoining Cameroon (South-West region). Habitat. A rare species; in gallery forest along streams and in understory of lower montane forests. Altitude 650-1670 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Vulnerable (VU) (Cosiaux et al. 2019b b). Uses in Cameroon. None reported. Notes. Xylopia monticola is similar to X. thomsonii in having 1-flowered inflorescences and multiple (3 to 4) bracts, but may be distinguished by the more conspicuous abaxial vein reticulum of the leaves, the longer outer petals, and the relatively small monocarps with a proportionally longer stipe. Xylopia monticola is always a tree, while X. thomsonii is usually a scandent shrub and only rarely an upright tree. Xylopia monticola seems to be restricted to higher elevations than X. thomsonii but closer comparison of the two taxa in the South-West Region and adjoining areas is needed. Specimens examined. South-West Region: Near Aguosho 10 km SSW of Akwaya, 6.3°N, 9.466°E, 20 March 1985, Thomas D.W. 4558 (MO); Takamanda Forest Reserve along footpath from Malishi to Kalu 6.15°N, 9.433°E, 01 May 1987, Thomas D.W. 7400 (B,K,MO)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 474-475, DOI: 10.3897/phytokeys.207.61432, {"references":["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019b. Annickia chlorantha. The IUCN Red List of Threatened Species: e.T60762300A60762303. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T60762300A60762303.en"]}

Piptostigma oyemense Pellegr., Notul. Syst. (Paris) 14: 75, 1950 Figs 91, 93; Map 11I Type. Gabon. Woleu-Ntem; Oyem, Le Testu G.M.P.C. 9624, 21 Jun 1934: holotype: P[P00363276]; isotypes: BR[BR0000008802774, BR0000008802446]; BM[BM000553961]; P[P00363274, P00363275]. Description. Tree, 2-6 m tall, d.b.h. up to 10 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 3-4 mm long, 1-2 mm in diameter, pubescent, cylindrical, blade inserted on top of the petiole; blade 11-27 cm long, 4-9 cm wide, elliptic, apex acuminate, acumen 0.2-2.5 cm long, base cuneate, papyraceous, below sparsely pubescent when young, glabrous when old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below pubescent when young, glabrous when old; secondary veins 21 to 29 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous, peduncle like base 7-10 mm long, axial internodes 3-6 mm long, compact, sympodial rachis 27-42 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 2 per inflorescence; pedicel 11-18 mm long, ca. 1 mm in diameter, pubescent; in fruit ca. 12 mm long, ca. 2 mm in diameter, pubescent; basal bract ca. ca. 4 mm long, 2 mm wide; upper bract ca. 4 mm long, ca. 2 mm wide; sepals 3, valvate, free, 5-6 mm long, 3-4 mm wide, ovate, apex acuminate, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, 12-14 mm long, 3-4 mm wide, obovate, apex acuminate, base truncate, light green, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 40-50 mm long, 5-10 mm wide, elliptic, apex acute, base truncate, pink, margins wavy, pubescent outside, pubescent inside; stamens numerous, in 6 to 8 rows, ca. 1 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 3, ovary ca. 2 mm long, stigma globose, pubescent. Monocarps sessile, 1 to 3, 30-40 mm long, 25-30 mm in diameter, ellipsoid, apex rounded, pubescent when immature, glabrous when mature, verrucose, not ribbed, white with pink when ripe; seeds 3 to 5 per monocarp, 10-15 mm long, 5-10 mm in diameter, ellipsoid; aril absent. Distribution. Known from Cameroon to Gabon; in Cameroon known from South and South-West regions. Habitat. A rarely collected species in Cameroon; in rain forests on the slope of mountains. Altitude 450-900 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Vulnerable B2ab(iii) (Cosiaux et al. 2019a p). Uses in Cameroon. None reported. Notes. Piptostigma oyemense is characterized by its elliptic leaf blades, glabrous on both sides when old, and its inflorescence usually with a single flower (rarely 2) and 3 carpels. The only other species with a single flower per inflorescence and up few carpels (less than 4) is P. fugax, which has obovate to very narrowly obovate leaf blades, a cuneate leaf base (versus obtuse to acute), a pubescent midrib on the upper ide (versus glabrous), the longer inner petals between 20-40 mm long (versus 40-50 mm) and the tomentose monocarps (versus glabrous when mature). Cheek and Cable (1998, p. 11) mention two specimens as Piptostigma sp. nov. (Akogo 34, Harris 3755) collected from Mont Cameroon. We identified the former as P. oyemense. We did not see Harris 3755. Specimens examined. South Region: Akom II, 2.78°N, 10.55°E, 12 December 2013, Kamdem N. 159 (YA). South-West Region: Bomana, 4.28°N, 9.060°E, 05 October 1993, Akogo M. 34 (K,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 303-305, DOI: 10.3897/phytokeys.207.61432, {"references":["Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371","Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019a. Annickia affinis. The IUCN Red List of Threatened Species: e.T132512369A132513599. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132512369A132513599.en"]}

Monanthotaxis elegans (Engl. & Diels) Verdc., Kew Bull. 25(1): 25, 1971 Fig. 49; Map 7C ≡ Popowia elegans Engl. & Diels, Monogr. Afrik. Pflanzen.-Fam. 6: 45, 1901. Type. Cameroon. South Region; Bipindi, Zenker G.A. 1321, 23 Mar 1897: holotype: B[B100153023]; isotypes: BM[BM000553832, BM000553833]; E[E00181437]; G[G00308366]; HBG[HBG-502506]; K[K000198990, K000198991]; M[M-0198713]; P[P00362605, P00362606]. Description. Liana, up to 4 m tall, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches densely pubescent with dense appressed to ascending reddish brown hairs 0.1-0.2 mm long. Leaves: petiole 3-5 mm long, ca. 1 mm in diameter, densely pubescent, slightly grooved, blade inserted on top of the petiole; blade 4.6-15.4 cm long, 2.3-4.6 cm wide, narrowly oblong-elliptic to oblong-oblanceolate (to obovate), apex acute to acuminate, acumen ca. 3 cm long, base rounded to subcordate, papyraceous, below sparsely pubescent when young and old, above sparsely pubescent when young and old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below sparsely pubescent when young and old; secondary veins 11 to 14 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on foliate branches, leaf opposed to extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 8 per inflorescence, glomerule-like; pedicel 1-2 mm long, ca. 1 mm in diameter, densely pubescent with appressed yellowish brown hairs; in fruit 4-5 mm long, ca. 1 mm in diameter; basal bract ca. 1 mm long, ca. 0.5 mm wide; upper bract ca.1 mm long, ca. 0.5 mm wide; sepals 3, valvate, free, ca. 1 mm long, 1-2 mm wide, triangular to ovate, apex acute, base truncate, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner, inner petals entirely covered in bud; outer petals 3, 2.6-4.3 mm long, 2.6-3.5 mm wide, ovate, apex acute, base truncate, yellow to cream, margins flat, densely pubescent outside, glabrous, pubescent towards margins inside; inner petals 3, valvate, ca. 3.5 mm long, ca. 2 mm wide, rhombic, apex acute, base truncate, yellow to cream, margins flat, pubescent towards base outside, pubescent inside; stamens 9, in 1 row, ca. 1 mm long, linear to oblong; connective truncate, glabrous; staminodes 6, alternating with the stamens, minute, glabrous; carpels free, 12 to 20, ovary ca. 1 mm long, stigma globose, glabrous. Monocarps stipitate, stipes ca. 2 mm long, ca. 2 mm in diameter; monocarps 2 to 8, 9-16 mm long, 5-6 mm in diameter, ellipsoid, apex apiculate, glabrous, verrucose, constricted around seeds when more than 1, color unknown; seeds 1 to 2 per monocarp, 7-9 mm long, 5-6 mm in diameter, ellipsoid; aril absent. Distribution. endemic to Cameroon, known from the Central and South regions. Habitat. In primary lowland rain forests and gallery forests, open rocky spot on sandy soil. Altitude 50-500 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Endangered (EN) (Hoekstra et al. 2021). Uses in Cameroon. None reported. Notes. Monanthotaxis elegans is generally distinguished by its oblong-lanceolate leaves and extra-axillary or terminal glomerule-like inflorescences with yellow-brown pubescence. The specimen Annet 348 [P01960095] has obovate instead of oblong-lanceolate leaves, but the inflorescence and flowers are typical for M. elegans. Specimens examined. Central Region: Riverine forest bank Nyong river near the new bridge ca 65 km SSW of Eseka, 3.46°N, 10.5°E, 16 June 1964, de Wilde W.J.J.O 2709 (B,BR,K,MO,P,WAG,YA); Natchigal ca 20 km N of Obala, 4.35°N, 11.63°E, 01 July 1964, de Wilde W.J.J.O 2787 (B,BR,K,MO,P,WAG,YA). South Region: Bipinde, 3.26°N, 10.20°E, 20 June 1918, Annet E. 348 (BR,K,P); Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.48°N, 10.33°E, 13 February 2015, Couvreur T.L.P. 704 (WAG,YA); Bipindi, 3.08°N, 10.41°E, 1897, Zenker G.A. 132 (L); Bipindi, 3.08°N, 10.41°E, 1897, Zenker G.A. 1321 (E,M,P); Lokoundjé, 3.08°N, 10.41°E, 01 January 1913, Zenker G.A. 199 (U,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1904, Zenker G.A. 2693 (E,L,M,P,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1911, Zenker G.A. 4000 (E,L,M,P); Bipindi, 3.08°N, 10.41°E, 01 January 1912, Zenker G.A. 4477 (E,L,M); Bipindi, 3.05°N, 10.25°E, Zenker G.A. s.n. (P)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 191-192, DOI: 10.3897/phytokeys.207.61432, {"references":["Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01"]}

Xylopia letestui Pellegr., Bull. Mus. Natl. Hist. Nat. 26: 658, 1920 Fig. 146; Map 18B = Xylopia letestui var. longepilosa Le Thomas, Fl. Gabon 16: 178, 1969. Type. Gabon. Ngounié, Moumba, Haute Ngounyé, Le Testu G.M.P.C. 6046, 3 Sep 1926: holotype: P[00169154]; isotypes: BM[000511049]; BR[0000008825315]; P[00169153, 00169155]. Type. Gabon. Nyanga; Mayombe Bayaka, Tono-Sanga Le Testu G.M.P.C. 1760, 9 Aug 1914: holotype: P[P00169125]; isotypes: BM; K[K000199054]; BR[BR0000008825322]; EA[EA000002492]; LISC[LISC000403]; P[P00169126, P00169127]. Description. Tree, up to 40 m tall, d.b.h. up to 30 cm; buttresses present, narrow and thin. Old branches sparsely pubescent to glabrous, young branches densely pubescent, the hairs 0.4-1 mm long, branches sinuous or zigzagging. Leaves: petiole 1-2 mm long, ca. 2 mm wide, pubescent, grooved, blade inserted on top of the petiole; blade 4.7-10.9 cm long, 1.2-2.7 cm wide, lanceolate to lanceolate-oblong, apex acute, base truncate and often slightly asymmetrical, subcoriaceous, below densely pubescent when young, sparsely pubescent to densely pubescent when old, the hairs dull grayish brown, above glabrous when young and old, discolorous; midrib flat to slightly raised, above densely pubescent when young, glabrous to densely pubescent when old, below densely appressed-pubescent when young, sparsely appressed-pubescent to densely appressed-pubescent when old; secondary veins 8 to 14 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, axillary, peduncle ca. 2.5 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 4 per inflorescence; pedicel 1-7 mm long, ca. 1 mm in diameter, pubescent; in fruit 8-14 mm long, 2-3 mm in diameter, glabrous; bracts 2, evenly spaced, 2-6 mm long, 2-6 mm wide; sepals 3, valvate, basally to 2/3 fused, forming a cup, 4-6 mm long, ca. 3 mm wide, elliptic to ovate, apex acute to obtuse, base truncate, pubescent outside, glabrous inside; petals free, subequal; outer petals 3, 13-22 mm long, 2.3-3.2 mm wide at base, lanceolate-ligulate, linear-lanceolate, or narrowly triangular, elliptic, apex acute, base broad and concave, cream-colored with a purple blotch at the base, pubescent, base glabrous to densely pubescent outside, pubescent towards margins inside; inner petals 3, valvate, 10.3-18.1 mm long, 2.4-3.2 mm wide at base, linear-lanceolate, apex acute, base broad and concave with conspicuous hairy tufts on the margins, cream, densely pubescent outside, pubescent, and glabrous towards the base inside; stamens numerous, in 5 to 6 rows, 1-2 mm long, oblong; connective apex shield-like, glabrous; carpels 7 to 10, ovary 1 mm long, stigmas loosely connivent with tips free, linear, sinuate, 3-3.5 mm long, pubescent. Monocarps sessile; monocarps 4 to 7, 27-45 mm long, 21-34 mm wide, nearly spherical to ellipsoid, apex rounded or obtuse, pubescent, smooth to verrucose, wrinkled when dried, green outside, endocarp bright red; seeds up to 6 per monocarp, in two rows, 8-19 mm long, 8-13 mm wide, ellipsoid to flattened ellipsoid; sarcotesta grayish white in vivo; aril absent. Distribution. A widespread species with a disjunct distribution between West Africa, from Sierra Leone to Ghana, and Central Africa from eastern Nigeria to western Democratic Republic of the Congo; in Cameroon known from the East, South and South-West regions. Habitat. A fairly common species, especially visible as a young tree in the understory; in lowland primary and more rarely secondary rain forests, on both clay and well-drained sandy soil, Altitude 50-450 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Harvey-Brown 2019l). Uses in Cameroon. None reported. Notes. Xylopia letestui is easily distinguished even when sterile by its nearly sessile and densely pubescent leaves with truncate and often slightly asymmetrical bases. In addition, the inner petals are short and bear conspicuous hairy tufts on the margins toward the base. It is similar to X. villosa, but the lower leaf indument is not shiny and there are fewer flowers in the inflorescences. The sinuous young shoots with conduplicate new leaves sometimes seen in X. letestui have not been noted in specimens of X. villosa. Specimens examined. East Region: Dja Reserve (Réserve de Faune du Dja) Bouamir Research Area 90 km southeast of Akonolinga, 3.18°N, 12.79°E, 23 May 1997, Fogiel M.K. 2098 (MO,WAG); Entre Kondon I et Mbalam près Ngoila (axe Lomié Souanké), 2.85°N, 13.93°E, 22 December 1972, Letouzey R. 11707 (P,YA); A 15 km au Sud de Djouo (20 km E de Somalomo sur le Dja), 3.32°N, 12.93°E, 23 February 1962, Letouzey R. 4361 (P,YA). South Region: 24 km east from Lélé village, 2.28°N, 13.31°E, 08 September 2013, Couvreur T.L.P. 475 (WAG,YA); Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.49°N, 10.34°E, 12 February 2015, Couvreur T.L.P. 688 (WAG,YA); Sud Cameroun TDC, 2.65°N, 9.9°E, 15 November 1991, Hallé F. 4247 (P,WAG). South-West Region: Korup National Park P transect P plot subplot 4E, 5.01°N, 8.8°E, 24 February 2008, van der Burgt X.M. 1129 (BR,G,K,MO,P,WAG,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 466-467, DOI: 10.3897/phytokeys.207.61432, {"references":["Harvey-Brown, Y, 2019l. Xylopia letestui. The IUCN Red List of Threatened Species: e.T149069496A149069498. https://doi.org/10.2305/IUCN.UK.2019-2.RLTS.T149069496A149069498.en","Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371"]}

Artabotrys velutinus Scott Elliot, J. Linn. Soc., Bot. 30: 71, 1894 Fig. 15; Map 3A = Artabotrys nigericus Hutch., Bull. Misc. Inform. Kew 10: 356, 1921. Type. Nigeria. Jos North, Naraguta, Lely H.V. 541, 17 Aug 1921: holotype: K[K000198866]. = Artabotrys stenopetalus Engl. Notizbl. Königl. Bot. Gart. Berlin 2: 300, 1899. Syn. nov. Type. Cameroon. South Region, Bipindi, Zenker G.A. 1222, 1896: holotype: B[B10 0154052]; isotypes: GOET[GOET005675]; HBG[HBG502541]; K[K000198862]; M[M0107912]; MO[MO-216860]; NY[NY00025832]; P[P00363384, P00363385]; S[S07-13456]; WAG[WAG0053235]; WU[WU0025887, WU0025888]. ? Artabotrys stenopetalus var. parviflorus Pellegr., Mém. Soc. Linn. Normandie 26: 7, 1924. Type. Gabon. Nyanga, Tchibanga, Le Testu G.M.P.C. 1964, 6 Jan 1915: lectotype, sheet here designated: P[P00363379]; isotypes: EA[EA000002453, EA000002452]; K[K000198861]; LISC[LISC000375]; P[P00363378, P00363380]. = Artabotrys nitidus auct. Exell Jour. of Bot. 73 Supp. Polypet. Add.: 5, 1935 (non Diels) (specimens Gossweiler 5978 [COI00070298] and 7361 [COI00070297]). Type. Sierre Leone: Northern Region; Falaba, Scott Elliot G.F. 5137, 5 Mar 1892: holotype: K[K000198865]; isotype: B[B 10 0154055]. Description. Liana, up to 10 m tall, d.b.h. up to 20 cm. Indumentum of simple hairs; old leafless branches sparsely pubescent, young foliate branches pubescent. Leaves: petiole 3-4 mm long, ca. 1 mm in diameter, pubescent to glabrous, grooved, blade inserted on the side of the petiole; blade 8-13 cm long, 4-5 cm wide, ovate to elliptic, apex acuminate to acute, acumen 1-1.5 cm long, base decurrent to acute, papyraceous, below pubescent to sparsely pubescent when young, glabrous when old, above pubescent when young, sparsely pubescent to glabrous when old, concolorous; midrib impressed, above glabrous when young and old, below densely pubescent to pubescent when young, glabrous to pubescent when old; secondary veins 8 to 12 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old leafless branches, leaf opposed. Flowers with 9 perianth parts in 3 whorls, 5 to 15 per inflorescence, hook-shaped peduncle 10-16 mm long; pedicel 2-10 mm long, ca. 1 mm in diameter, pubescent with appressed hairs; in fruit 10-20 mm long, ca. 1 mm in diameter, pubescent with appressed hairs; bracts 2, all basal, ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, 2-3 mm long, 2-3 mm wide, triangular, apex acute, base truncate, densely pubescent outside, glabrous inside, yellow and red at the base, margins flat; petals free, sub equal; outer petals 3, 5-15 mm long, 1-2 mm wide, linear, apex rounded, base broad and concave, margins flat but strongly recurved inwards forming a tube, densely pubescent outside, densely pubescent inside; inner petals 3, valvate, 5-15 mm long, 1-2 mm wide, linear, apex acute, base broad and concave, yellow and red at the base, margins flat but strongly recurved inwards forming a tube, tomentose outside, tomentose with a glabrous at base inside; stamens 15 to 22, in 2 rows, 1-2 mm long, oblong; connective discoid, glabrous; staminodes absent; carpels free, 7 to 12, ovary 1-2 mm long, stigma cylindrical, glabrous. Monocarps sessile, 4 to 9, 10-20 mm long, 10 mm in diameter, ellipsoid to obovoid, apex rounded, glabrous, smooth, faintly ribbed, color when ripe not seen; seeds 1 to 2 per monocarp, 5-7 mm long, 5 mm in diameter, flattened ellipsoid; aril absent. Distribution. A west and central African species, from Sierra Leone to Nigeria and Cameroon to the Republic of the Congo and in the Democratic Republic of the Congo; in Cameroon known from the Adamaoua, Central, East, North, South, South-West, and West regions. Habitat. A fairly common and widespread species; in secondary lowland premontane and montane rain forests, and in gallery forests occurring in the drier regions of the country, it is one of the few Annonaceae species (e.g. Monanthotaxis vulcanica; Xylopia africana) occurring above 2000 m in Cameroon. Altitude 400-2200 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not evaluated. Uses in Cameroon. medicine: water/sap/leaves used for liver, genital stimulant/depressants, pregnancy, antiaborifacients (as A. stenopetalus in Burkill 1985). Notes. Artabotrys velutinus is characterized by having leaf bases that are decurrent or acute, pubescent branches and petioles with appressed hairs and densely pubescent petals that are tightly recurved forming a tube. This latter character is also found in A. rufus, but in this species the pubescence is hirsute rather than appressed and the base of the leaves is rounded. Nevertheless, both species are very close morphologically. Artabotrys velutinus belongs to a large species complex of pubescent species with petals that are tightly recurved forming a tube. We synonymize here the name A. stenopetalus. Another species name that could also be synonym is the east African species A. monteiroae Oliv. (which would be the older name). More studies are needed across the range of these species to better define the limits of these taxa. The variety A. stenopetalus var. parviflorus is interesting. The type specimen (Le Testu 1964) appears to have a raised and grooved midrib on the upper side of the leaf blades (only seen as a scan on jstor), which is quite uncommon for African Annonaceae (Couvreur 2009), and the leaves are narrowly elliptic (versus elliptic for the type variety). The flowers however have the characteristic tubular petals. Pellegrin (1924, p. 7) only cites some minor differences such as smaller flowers, an acute leaf base (but this is also the case for the type variety) and petals that are adnate between them. We leave this name as a synonym of A. velutinus but further studies should be done to properly interpret the status of this variety name. Specimens examined. Adamaoua Region: Mbibol 40 km W de Ngaoundéré, 7.32°N, 13.58°E, 12 June 1977, Fotius G. 2660 (P,YA); Près Tekel (60 km NNO de Bagodo), 6.78°N, 13.17°E, 21 July 1966, Letouzey R. 7481 (P,YA); Boko 14 km Sud-Ouest de Ngaoundéré, 7.25°N, 13.5°E, 06 August 1981, van der Zon A.P.M. 1122 (WAG,YA). Central Region: Pentes orientales du mont Yangba (1473 m) près Nyafianga (42 km NNE de Bafia), 5.13°N, 11.35°E, 09 September 1966, Letouzey R. 7826 (K,P,YA). East Region: 27 km ENE de Mopwo (village situé au km 22 route Yokadouma-Batouri), 3.67°N, 15.08°E, 06 June 1963, Letouzey R. 5248 (K,P,YA). North Region: Mango, 8.42°N, 13.25°E, 21 July 1974, Fotius G. 2144 (YA). South Region: Rives du Ntem près du confluent de la Kye 16 km ESE d’Ambam, 2.25°N, 11.34°E, 01 February 1970, Letouzey R. 10040 (P); Bipindi, 3.08°N, 10.42°E, 3 April 1897, Zenker G.A. 1222 (B,P,WAG); Bipindi, 3.08°N, 10.42°E, 01 January 1913, Zenker G.A. 231 (P,U,WAG). South-West Region: Edip village to lake edip 2-3 km, 4.96°N, 9.65°E, 11 February 1998, Cheek M. 9143 (K,WAG,YA); Kodmin, 5°N, 9.7°E, 16 November 1998, Gosline W.G. 149 (K,YA); Bank of river Chide, 4.95°N, 9.72°E, 04 February 1998, Onana J.M. 523 (K,P,WAG,YA). West Region: Massif du Nkogam (2263 m) 25 km W de Foumban, 5.73°N, 10.67°E, 12 December 1974, Letouzey R. 13501 (P,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 78-81, DOI: 10.3897/phytokeys.207.61432, {"references":["Burkill, HM, 1985. The useful plants of West tropical Africa Vol. 4. 2nd ed. Royal Botanic Gardens Kew, Kew","Couvreur, TLP, 2009. Monograph of the syncarpous African genera Isolona and Monodora (Annonaceae). Systematic Botany Monographs 87: 1 - 150","Pellegrin, F, 1924. La flore de Mayombe d'apres les recoltes de M. Georges Le Testu. Memoires de la Societe Linneenne de Normandie 26: 1 - 128"]}

Cleistopholis staudtii (Engl. & Diels) Engl. & Diels, Monogr. Afrik. Pflanzen.-Fam. 6: 35, 1901 Figs 22, 23; Map 3F ≡ Oxymitra staudtii Engl. & Diels, Notizbl. Königl. Bot. Gart. Berlin 2: 297, 1899. = Polyalthia (?) crassipes Engl. Bot. Jahrb. Syst. 34: 477, 1907. Type. Cameroon. South Region, Bipindi, Zenker G.A. 2454a, 1902: holotype B destroyed, lectotype here designated: P[01988941]; isolectotypes: MO[MO-2500050]; P[P01988940, P01988942]. Type. Cameroon. South-West Region; Johann-Albrechtshöhe [Kumba], Staudt A. 957, 1896: holotype: B[B 10 0154076]; isotypes: BM[BM000546890]; K[K000105343]; LE[LE00012452] Description. Tree, 15-30 m tall, d.b.h. up to 30 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches glabrous. Leaves: petiole 10-20 mm long, ca. 3 mm in diameter, glabrous, grooved, blade inserted on the side of the petiole; blade 9-17 cm long, 3-6.5 cm wide, obovate, oblong to elliptic, apex acuminate, acumen ca. 1 cm long, base rounded to acute, coriaceous, below glabrous when young and old, above glabrous when young and old, discolorous, whitish below, midrib impressed, above glabrous when young and old, below glabrous when young and old; secondary veins 10 to 12 pairs, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young and old leafless branches, axillary, peduncle absent. Flowers with 9 perianth parts in 3 whorls, 2 to 3 per inflorescence; pedicel 12-20 mm long, ca. 1 mm in diameter, glabrous; in fruit 15-35 mm long, ca. 3 mm in diameter, glabrous; bracts 1 to 3, all basal, 1-2 mm long, 2 mm wide; sepals 3, valvate, free, ca. 2 mm long, ca. 2 mm wide, triangular to ovate, apex acute to rounded, base truncate, green, glabrous outside, glabrous inside, margins flat; petals free, outer petals longer than inner; outer petals 3, 15-20 mm long, 2-3 mm wide, linear, apex acute, base truncate, green, margins flat, glabrous outside, glabrous inside; inner petals 3, imbricate, 2-2.5 mm long, 3-3.5 mm wide, ovate, apex acute, base truncate, claw mm long, green, margins flat, glabrous outside, glabrous inside; stamens 30 to 40, in 3 to 4 rows, ca. 1 mm long, broad; connective discoid, pubescent, green; staminodes absent; carpels free, 15 to 22, ca. 1 mm long, stigma capitate, glabrous. Monocarps stipitate to sessile, stipes when present to 10 mm long, 3-4 mm in diameter, 3 to 8 monocarps, 15-20 mm long, 12-15 mm in diameter, globose, apex rounded, glabrous, striate, bumpy, constricted around seeds; seeds 1 to 3 per monocarp, 10-15 mm long, 7-10 mm in diameter, ellipsoid; aril absent. Distribution. From Cameroon to Gabon; in Cameroon known from South, Central, Littoral and South-West regions. Habitat. A common species when present, in lowland rain forests in primary or secondary habitats. Altitude 50-1000 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019h). Uses in Cameroon. construction: bark for building materials (Tessmann 1913). Notes. Easily distinguished from C. glauca and C. patens by its linear and acute outer petals, in contrast to short and rounded outer petals in the latter two. It is quite hard to distinguish these species based on sterile material alone. Specimens examined. Central Region: Ca 50 km NW of Eséka W of Yaoundé, 3.65°N, 10.78°E, 25 November 1963, de Wilde W.J.J.O 1342 (B,BR,C,DES,L,LD,MO,P,U,WAG,YA); Ottotomo Forest Reserve, 3.65°N, 11.31°E, Service Forestier du Cameroun 32 (P). South Region: ca 15 km from Kribi 1 km S of Ebolowa road, 2.85°N, 10.01°E, 20 February 1970, Bos J.J. 6383 (P,WAG); Station de cacaoyer de N’koemvone 14 km On the road from Ebolowa to Ambam, 2.81°N, 11.13°E, 02 February 1975, de Wilde J.J.F.E 7947 (B,BR,K,MO,P,U,WAG,YA); Près de Bella (45 km NE de Kribi), 3.25°N, 10.2°E, 25 January 1962, Letouzey R. 4149 (P,YA); Bipindi, 3.08°N, 10.41°E, 01 January 1900, Zenker G.A. 2264 (L,P,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1902, Zenker G.A. 2454 (L,P,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1902, Zenker G.A. 2495 (L,P,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1913, Zenker G.A. 4669 (L,P); Bipindi, 3.08°N, 10.41°E, 01 January 1913, Zenker G.A. 4880 (L,P). South-West Region: Ekundu Kundu, 5.16°N, 8.874°E, 11 April 1996, Cable S. 1825 (K,YA); Kupe Mount Path to Kupe Rock, 4.75°N, 9.686°E, 24 November 1995, Cheek M. 7915 (K,P,WAG); Muanezum trail from Kupe village towards Daniel Ajang’s area 4.77°N, 9.708°E, 18 July 1996, Etuge M. 2884 (K,MO,P,WAG); Just outside Kupe village going north, 4.77°N, 9.688°E, 29 November 1999, Gosline W.G. 240 (K,MO,P,WAG,YA); Korup National Park, 5.06°N, 8.855°E, 05 December 1997, Kenfack D. 984 (MO,P,WAG); Environs of Kumba farmed land and scrub with scattered trees, 4.63°N, 9.433°E, 01 March 1984, Thomas D.W. 3271 (MO,WAG,YA).

Monanthotaxis vogelii (Hook. f.) Verdc., Kew Bull. 25(1): 23, 1971 Map 9D ≡ Uvaria vogelii Hook.f., in Hooker Icon. Pl. 4: 767, 1848; Clathrospermum vogelii (Hook.f.) Benth., in Bentham & Hooker 29, 1862; Popowia vogelii (Hook.f.) Baill.; Adansonia 8: 324, 1868. = Popowia dalzielii Hutch., in Hutch. & Dalziel 55, 1927. Type. Nigeria. Benue State, Abinsi, Dalziel J.M. 712, 13 Sep 1972: lectotype, chosen by Hoekstra et al. (2021), p. 208: K [K000198917, K000913659]; isolectotypes: BM[BM001125037]; MO [2 sheets]; P[P00362644, P00362645]. = Monanthotaxis angustifolia (Exell) Verdc., Kew Bull., 25(1): 21, 1971; Enneastemon angustifolius Exell, J. Bot. 75: 163, 1937. Type. Nigeria. Ogun State, Ijebu, Shasha Forest reserve, Richards P.W. 3469, 17 May 1935: holotype: BM[BM000547356, BM001125040, BM001125041]; isotype: MO[MO-1889425]. Type. Nigeria. Benue State; Abinsi, Dalziel, J.M. 712, 13 Sep 1972: holotype: K[K000198917, K000913659]; isotypes: BM[BM001125037]; MO [2 sheets]; P[P00362644, P00362645]. Description. Scandent shrub to liana, 3 m tall, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrescent, young foliate branches sparsely pubescent with appressed reddish brown hairs 0.1-0.2 mm long. Leaves: petiole 2-5 mm long, 1 mm in diameter, sparsely pubescent with appressed reddish brown hairs, slightly grooved, blade inserted on top of the petiole; blade 9.7-17.5 cm long, 2.5-5.6 cm wide, obovate to oblanceolate, apex acuminate to acute, acumen 1.5 cm long, base cuneate to rounded, chartaceous, below sparsely pubescent when young and old, above sparsely pubescent with appressed whitish hairs when young, sparsely pubescent to glabrous when old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below sparsely pubescent when young and old; secondary veins 7 to 12 pairs, glabrous above; tertiary venation percurrent. Individual bisexual, inflorescences ramiflorous on old leafless branches, axillary. Flowers with 9 perianth parts in 3 whorls, 2 to 3(4) per inflorescence; pedicel 6-9(14) mm long, ca. 1 mm in diameter, densely pubescent with appressed yellow-brown hairs; in fruit 7-13 mm long, ca. 1 mm in diameter; upper bract soon falling ca. 2 mm long, ca. 0.7 mm wide; sepals 3, valvate, basally fused, 0.5-1 mm long, 1-1.5 mm wide, broadly ovate to broadly triangular, apex acute to rounded, base truncate, sparsely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner, inner petals partly covered in bud; outer petals 3, 2.4-3.3 mm long, 2 mm wide, elliptic to ovate, apex obtuse, base truncate, margins flat, sparsely pubescent outside, glabrous inside; inner petals 3, valvate, 2-2.7 mm long, 1.3 mm wide, elliptic, apex obtuse, base truncate, margins flat, sparsely pubescent outside, glabrous and sparsely pubescent towards apex inside; stamens (8)9, in 1 row, 1 mm long, linear to oblong; connective truncate, glabrous; staminodes 6, alternating with the stamens, glabrous; carpels free, 8 to 12, 2 mm long, stigma elongate, glabrous. Monocarps stipitate, stipes 2-4 mm long, ovary ca. 2 mm in diameter; monocarps 2 to 9, 11-15 mm long, 4-6 mm in diameter, not moniliform, ellipsoid, apex apiculate, pubescent, smooth, red when ripe; seed 1 per monocarp, ca. 10 mm long, 4-5 mm in diameter, ellipsoid; aril absent. Distribution. Known from Ghana, Ivory Coast, Benin, Nigeria and just reaching into Cameroon; in Cameroon known from the South-West region. Habitat. An infrequent species in Cameroon known from a single collection; in gallery or swamp forests, savannah open woodland and open high forest. Growing in cracks of schist rocks, on rocky islands, on loamy soil and on black clay. Altitude ~800 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Least Concern (LC) (Hoekstra et al. 2021). Uses in Cameroon. None reported. Notes. Monanthotaxis vogelii can be readily recognized among Cameroonian species by its obovate to oblanceolate leaves with a cuneate (or sometimes rounded) base, and secondary veins that form an acute angle with the primary vein. The monocarps are composed of a single seed (developing from a single ovule). The only specimen of this species from Cameroon was initially identified as M. angustifolia, however the name M. angustifolia was synonymized by Hoekstra et al. (2021). Indeed, the leaf shape was variable within M. angustifolia and intermediates exist with M. vogelii. Besides leaf shape, no other differences were found. Specimen examined. South-West Region: Mamfe Div on Cross river between Mamfe and the Nigerian boundary Abonando, 5.54°N, 9.07°E, 06 May 1902, Rudatis H. 54 (K)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 239-240, DOI: 10.3897/phytokeys.207.61432, {"references":["Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01"]}

Hexalobus bussei Diels, Bot. Jahrb. Syst. 39: 479, 1907 Fig. 30; Map 4E = Hexalobus megalophyllus Engl. & Diels, Bot. Jahrb. Syst. 39: 479, 1907. Type. Cameroon. South Region, Bipindi, Zenker G.A. 2889, 1904: holotype: B[B100154197]; isotypes: BR[BR0000015306210]; COI[COI00033178]; F; G[G00011590]; HBG[HBG518920]; K[K000198935]; L[L-0049297]; M[M0089222]; MO[MO-2246481]; P[P00315838]; S[S12-22791]; US[00098767]; WAG[WAG0053629]; WRSL; WU[WU 0025867]; Z[Z-000000827]. Type. Cameroon. South Region; Kribi, Busse W.C.O. 3216, 1904: holotype: B[B 10 0154198]. Description. Tree, 20-30 m tall, d.b.h. unknown; stilt roots or buttresses absent, trunk slender, not fluted. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 1-7 mm long, 3-4 mm in diameter, pubescent, grooved, blade inserted on the side of the petiole; blade 15.5-36 cm long, 5.5-10 cm wide, obovate, apex acuminate, acumen 0.5-1 cm long, base cordate, coriaceous, below glabrous when young and old, above sparsely pubescent to glabrous when young, sparsely pubescent to glabrous when old, concolorous; midrib sunken or flat, above pubescent when young and old, below pubescent when young and old; secondary veins 12 to 17 pairs; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old leafless or young foliate branches, axillary. Flowers with 9 perianth parts in 2 whorls, 1 to 2 per inflorescence; pedicel 10-12 mm long, 4-5 mm in diameter, densely pubescent; in fruit 10-13 mm long, 2-3 mm in diameter, glabrous; bracts 5 to 6, several basal and two (sometimes fused) towards the upper half of pedicel, basal bracts 3-9 mm long, 2-5 mm wide; upper bracts 6-13 mm long, 2-3 mm wide; sepals 3, valvate, free, 16-20 mm long, 11-14 mm wide, ovate, apex acute, base truncate, brown, densely pubescent outside, glabrous inside, margins flat; petals basally fused, tube 2-5 mm long, purple, inner and outer whorl not differentiated, equal, lobes 23-40 mm long, 8-10 mm wide, elliptic, apex rounded, pale yellow, margins wavy, densely pubescent outside, densely pubescent inside, plicate; stamens numerous, 7-8 mm long, elongated; connective elongated, glabrous; staminodes absent; carpels free, 3 to 7, ovary 4-5 mm long, stigma elongate, pubescent. Monocarps stipitate, ca. 1 mm long, ca. 3 mm in diameter; monocarps 2 to 4, 53-78 mm long, ca. 40 mm in diameter, ellipsoid, apex rounded, sparsely pubescent, rugose, irregularly ribbed in reticulate pattern, orange when ripe; seeds 17 to 19 per monocarp, 23-28 mm long, 17-19 mm in diameter, flattened ellipsoid; aril absent. Distribution. endemic to Cameroon; known from the South region. Habitat. A rare species, in primary lowland rain forests, sometimes riverine. Altitude 0-200 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Endangered (EN) (Cosiaux et al. 2019l). Uses in Cameroon. None recorded. Notes. Hexalobus bussei is distinguished by its large leaf blades (15-36 cm long) and the irregularly ridged and strongly rugose surface of its monocarps. Specimens examined. South Region: S bank of Kienke river just E of Kribi, 3.1°N, 10.25°E, 12 May 1969, Bos J.J. 4495 (P,WAG); 21 km from Kribi high forest exploitation N of Lolodorf road, 3.03°N, 10.05°E, 07 August 1969, Bos J.J. 5157 (BR,P,WAG,YA); ca 16 km from Kribi Lolodorf road, 3°N, 10.01°E, 19 September 1969, Bos J.J. 5370 (BR,C,K,LD,LM,MO,P,WAG,YA); Kribi, 2.95°N, 9.916°E, 01 September 1904, Busse W.C.O. 3216 (B); 31 km ESE Kribi N of Kienke River Nyabessan, 2.9°N, 10.16°E, 19 April 1968, Letouzey R. 9387 (P,YA); Bipindi, 3.08°N, 10.42°E, 01 January 1904, Zenker G.A. 2889 (B,BR,COI,F,G,L,M,MO,P,S,WAG); Bipindi, 3.08°N, 10.42°E, 26 October 1908, Zenker G.A. 3550 (BR,COI,G,M,MO,P,S); Bipindi, 3.08°N, 10.41°E, 01 January 1908, Zenker G.A. 3592 (G,K); Bipindi, 3.08°N, 10.41°E, 01 January 1909, Zenker G.A. 3889 (BR,COI,G,K,L,M,MO,P,S); Bipindi, 3.08°N, 10.42°E, 01 January 1913, Zenker G.A. 4831 (BR,G,P,S)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 119-121, DOI: 10.3897/phytokeys.207.61432, {"references":["Botermans, M, Sosef, MSM, Chatrou, LW, Couvreur, TLP, 2011. A revision of the African genus Hexalobus (Annonaceae). Systematic Botany 36: 33 - 48, DOI: https://doi.org/10.1600/036364411X553108","Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019l. Hexalobus bussei. The IUCN Red List of Threatened Species: e.T132520196A132520522. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132520196A132520522.en"]}

Monanthotaxis submontana P.H.Hoekstra, Blumea 66 (1): 200, 2021 Fig. 69; Map 9B = Monanthotaxis cauliflora sensu Cheek et al. (2004): 238. Type. Cameroon. Littoral Region; Nlonako, Letouzey R.G. 14476, 17 Mar 1976: holotype: WAG[WAG0053953]; isotypes: MO[2 sheets]; P[P01982361]. Description. Liana, 6-10 m tall, d.b.h. up to 5 cm. Indumentum of simple hairs; old leafless branches glabrescent, young foliate branches pubescent with short 0.1-0.2 mm long appressed to half-erect yellowish hairs. Leaves: petiole 6-10 mm long, ca. 1 mm in diameter, pubescent, weakly grooved adaxially, blade inserted on the side of the petiole; blade 7.2-14.1 cm long, 2.1-3.5 cm wide, oblong to narrowly oblong or elliptic to narrowly elliptic, apex acuminate to acute, acumen ca. 1.5 cm long, base cuneate, papyraceous, below sparsely pubescent when young, sparsely pubescent to glabrous when old, above glabrous when young and old, discolorous, whitish below; midrib sunken or flat, above glabrous when young and old, below sparsely pubescent when young and old; secondary veins 11 to 18 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual [although fertile stamens can be absent leading to a female flower, thus possibly individuals gynodioecious], inflorescences cauliflorous, a condensed panicle with many flowers; peduncle up to ca. 70 mm, densely pubescent with appressed to erect reddish brown hairs; Flowers with 9 perianth parts in 3 whorls, pedicel 7-55 mm long, ca. 1 mm in diameter, densely pubescent with reddish hairs; in fruit 17-55 mm long, 1-2 mm in diameter; basal bract 1-2 mm long, 1-2 mm wide; upper bract 1-2 mm long, 1-2 mm wide; sepals 3, valvate, free, 3-2 mm long, ca. 2 mm wide, ovate, apex acute, base truncate, golden brown, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner, inner petals entirely covered in bud; outer petals 3, 3.6-5 mm long, 3.6-5.7 mm wide, broadly ovate to circular, apex obtuse, base truncate, golden green outside, yellowish inside, margins flat, densely pubescent outside, pubescent inside; inner petals 3, valvate, 0.4-1.3 mm long, 0.3-1.1 mm wide, broadly elliptic to circular, apex obtuse, base truncate, margins flat, pubescent outside, pubescent inside; stamens 0 to 2, in 1 row near the inner petals, ca. 1 mm long, clavate to oblong; connective reduced hidden by the thecae, pubescent; staminodes 0 to 14; carpels free, 65 to 85, ovary ca. 1 mm long, stigma globose, glabrous. Monocarps stipitate, stipes 7-14 mm long, 2 mm in diameter; monocarps up to 18, 23-45 mm long, 7-9 mm in diameter, moniliform, ellipsoid, apex apiculate, pubescent, smooth to slightly verrucose, constricted around seeds when more than 1, green when ripe; seeds 1 to 4 per monocarp, 13-14 mm long, 6-8 mm in diameter, ellipsoid; aril absent. Distribution. endemic to Cameroon, known from the South-West and Littoral regions. Habitat. In sub-montane or montane rain forests and swamp forests. Altitude 800-1700 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Endangered (EN) (Hoekstra et al. 2021). Uses in Cameroon. None reported. Notes. Monanthotaxis submontana is distinguished by its oblong to elliptic leaves with a cuneate base, cauliflorous inflorescences with a peduncle up to 70 mm long, flowering pedicels ranging from 7 to 55 mm long and flowers with 65 to 85 carpels. Specimens identified as Monanthotaxis cauliflora in Cheek et al. (2004) are in fact redetermined as M. submontana (Hoekstra et al. 2021). Specimens examined. Littoral Region: Nlonako Mt, 4.90°N, 9.943°E, 17 March 1976, Letouzey R. 14476 (MO,P,WAG). South-West Region: Ridge on S side of LOH Mt, 5°N, 9.683°E, 23 January 1998, Cheek M. 9067 (K,WAG,YA); Kodmin to Nzee Mbeng trail at N’dib river crossing, 5°N, 9.716°E, 14 February 1998, Cheek M. 9202 (K,WAG,YA); Bakossi Mountains 1-8 km NNE of Menyum Village, 5.05°N, 9.612°E, 22 May 1987, Doumenge C. 554 (MO,P); Nzimbeng road, 5.93°N, 9.716°E, 04 February 1998, Etuge M. 4122 (K,WAG,YA); Kodmin road towards Mahusom, 5°N, 9.683°E, 12 November 1998, Etuge M. 4442 (K,WAG,YA); Bakossi Mountains west of Bangem, 5.08°N, 9.7°E, 01 January 1986, Thomas D.W. 5274 (MO,P,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 232-235, DOI: 10.3897/phytokeys.207.61432, {"references":["Cheek, M, Pollard, BJ, Darbyshire, I, Onana, JM, Wild, C, 2004. The plants of Kupe, Mwanenguba and the Bakossi Mountains, Cameroon. A conservation checklist. Kew Publishing. Cromwell Press, Trowbridge, Kew, U.K.","Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01"]}

Xylopia paniculata Exell, J. Bot. 64 (Suppl.): 8, 1926 Map 18F Type. Angola. Cabinda; Belize, Mayumbe, Gossweiler J. 6988, no date: holotype: BM; isotypes: COI[COI00004886]; LISC[LISC000323, LISC000324, LISC000322, LISC000321] Description. Tree, up to 35 m tall, d.b.h. up 35 cm; stilt roots or small buttresses present. Old branches glabrous, young branches glabrous to pubescent with loosely appressed hairs 0.4-0.9 mm long. Leaves: petiole 2-3 mm long, 1 mm wide, pubescent, grooved, blade inserted on the side of the petiole; blade 7.2-11.5 cm long, 1.8-2.7 cm wide, narrowly oblong to elliptic, apex acuminate, acumen 0.2-0.7 cm long, base decurrent to cuneate, papyraceous to subcoriaceous, below sparsely pubescent when young, sparsely pubescent when old, above glabrous when young and old, somewhat shiny above, slightly discolorous; midrib raised to slightly sunken, above sparsely pubescent when young, glabrous when old, below pubescent when young, sparsely pubescent when old; secondary veins 8 to 16 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, axillary, peduncle 2-3 per axil, highly branched, 1-4.5 mm long, sometimes with a longer floriferous axis emerging from among the cluster of flowers in an axil. Flowers with 9 perianth parts in 3 whorls, up to 32 per inflorescence; pedicel 2-3 mm long, ca. 1 mm in diameter, pubescent; in fruit 23-30 mm long, 2-3 mm in diameter, sparsely pubescent; bracts 1 or 2, at or above the middle of pedicel, 2-3 mm long, ca. 1 mm wide; sepals 3, valvate, basally fused, 2-3 mm long, 2-3 mm wide, ovate, apex acute to obtuse, base truncate, pubescent outside, glabrous inside; petals free, inner and outer whorl subequal; outer petals 3, 10-19.7 mm long, 2.3-3.6 mm wide at base, linear-lanceolate, apex obtuse, base broad and concave, yellow-green with red base, densely pubescent outside, pubescent and glabrous towards center inside; inner petals 3, valvate, 9.7-13.1 mm long, 2.2-2.5 mm wide at base, linear, apex acute, base broad and concave, yellow-green with red base, pubescent, base glabrous outside, pubescent, base glabrous inside; stamens 120 to 130, in 5 to 6 rows, 1-2 mm long, narrowly oblong; connective apex capitate, glabrous; carpels 3 to 6, ovary ca. 1 mm long, stigmas connivent, filiform, 2.5-2.7 mm long, sparsely pubescent. Monocarp stipitate, stipe 2-3 mm long, 2-3 mm in diameter; monocarp 1, 56-85 mm long, 31-40 mm wide, obovoid to oblongoid, apex rounded, pubescent, longitudinally ridged and wrinkled when dried, green outside, endocarp carmine, red or pink-red; seeds 3 to 4 per monocarp, in a single row, 21-22 mm long, 16-17 mm wide, flattened ellipsoid; sarcotesta grayish blue or greenish blue in vivo; aril absent. Distribution. A sparsely distributed species from Cameroon to Angola (Cabinda); in Cameroon known from a single collection in the East region. Habitat. A very rare species in general; in primary rain forests. Altitude unknown, but probably lowland. Local and common names known in Cameroon. None recorded. IUCN conservation status. Endangered (EN) (Cosiaux et al. 2019b c). Uses in Cameroon. None reported. Notes. Xylopia paniculata is distinguished by its highly branched inflorescences with up to 32 flowers, a unique characteristic for African species. The monocarps and seeds are among the largest of any African Xylopia species. The specimen label of the single Cameroon specimen lists Baillonella toxisperma and Pentaclethra macrophylla as associated species. Specimen. East Region: A 23 km à l’Ouest de Maséa (village situé à 50 km au SSW de Yokadouma, 3.15°N, 14.87°E, 04 July 1963, Letouzey R. 5402 (P,YA)., Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 475-476, DOI: 10.3897/phytokeys.207.61432, {"references":["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019b. Annickia chlorantha. The IUCN Red List of Threatened Species: e.T60762300A60762303. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T60762300A60762303.en"]}