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We summarize the knowledge on taxonomy and distribution of the genus Parnassia in Vietnam. Two species of the genus are found in Vietnam. We report additional records of P. wightiana, which appears to inhabit the provinces Ha Giang and Yen Bai. We provide detailed morphological description of the Vietnamese populations of this species, and discuss their deviation from the known variation range of P. wightiana. We report for the first time the second species of Parnassia from Vietnam, and provisionally identify it as P. procul. Our discovery of this species in Lam Dong Province in southern Vietnam is the first record of the genus outside the northern highlands within the country. We illustrate both Vietnamese species of Parnassia with analytical photographs, and show their distribution on a map. Additionally, we present an updated checklist of the family Celastraceae in Vietnam, which reflects the most recent views on taxonomic boundaries of the family and its genera, and includes discoveries of the last years as well as some earlier reports absent in the previous works. In total, 17 genera and 93 species are accepted in the checklist.

4. Elaeodendron Jacq. 1(14) Elaeodendron glaucum (Rottb.) Pers. (Pitard 1912a, Nguyen 2003a, Pham 2003), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 225, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

15. Salacia L. 1(77) Salacia chinensis L. (Pitard 1912b, Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003) 2(78) Salacia cochinchinensis Lour. 3(79) Salacia dongnaiensis Pierre 4(80) Salacia gagnepainiana Tardieu 5(81) Salacia godefroyana Pierre 6(82) Salacia laotica Pit. (Tardieu-Blot 1948b, Nguyen 2003a) 7(83) Salacia macrophylla Blume (Nguyen 2003a) 8(84) Salacia noronhioides Pierre 9(85) Salacia pallens Pierre (Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003) 10(86) Salacia phuquocensis Tardieu 11(87) Salacia rostrata Pierre 12(88) Salacia typhina Pierre 13(89) Salacia verrucosa Wight (Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003) 14(90) Salacia viminea Wall. (Nguyen 2003a, Pham 2003) 15(91) Salacia viridis Craib (Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003)

8. Loeseneriella A.C.Sm. 1(52) Loeseneriella chesseana (Pierre) Tardieu 2(53) Loeseneriella dinhensis (Pierre) A.C.Sm. 3(54) Loeseneriella merrilliana A.C.Sm. (Tardieu-Blot 1948b, Nguyen 2003a) 4(55) Loeseneriella pauciflora (DC.) A.C.Sm. (Nguyen 2003a, Pham 2003)

2. Bhesa Buch. -Ham. ex Arn. 1(2) Bhesa robusta (Roxb.) Ding Hou (Pitard 1912a, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 225, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

5. Euonymus L. 1(15) Euonymus acanthoxanthus Pit. 2(16) Euonymus balansae Sprague 3(17) Euonymus cochinchinensis Pierre 4(18) Euonymus eberhardtii Tardieu 5(19) Euonymus fortunei (Turcz.) Hand. -Mazz. (Ma 2001) 6(20) Euonymus glaber Roxb. (Pitard 1912a, Tardieu-Blot 1948a, Ma 2001, Nguyen 2003a, Pham 2003) 7(21) Euonymus grandiflorus Wall. (Ma 2001) 8(22) Euonymus indicus B.Heyne ex Wall. (Pitard 1912a, Ma 2001, Nguyen 2003a, Pham 2003) 9(23) Euonymus japonicus Thunb. (Pitard 1912a, Ma 2001, Nguyen 2003a, Pham 2003) 10(24) Euonymus laxiflorus Champ. ex Benth. (Pitard 1912a, Tardieu-Blot 1948a, Ma 2001, Nguyen 2003a, Pham 2003) 11(25) Euonymus nitidus Benth. (Pitard 1912a, Ma 2001, Nguyen 2003a, Pham 2003) 12(26) Euonymus petelotii Merr. 13(27) Euonymus pittosporoides C.Y.Cheng ex J.S.Ma (Ma 2001) 14(28) Euonymus pseudovagans Pit. 15(29) Euonymus salicifolius Loes. (Ma 2001) 16(30) Euonymus tonkinensis (Loes.) Loes., Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 225, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

3. Celastrus L. 1(3) Celastrus annamensis Tardieu 2(4) Celastrus gemmatus Loes. (Merrill 1938, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 3(5) Celastrus glaucophyllus Rehder & E.H.Wilson (Hou 1955) 4(6) Celastrus hindsii Benth. (Pitard 1912a, Tardieu-Blot 1948a, Hou 1955, Nguyen 2003a, Pham 2003) 5(7) Celastrus hirsutus Comber (Hou 1955) 6(8) Celastrus hookeri Prain (Merrill 1938, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 7(9) Celastrus monospermus Roxb. (Merrill 1938, Tardieu-Blot 1948a, Hou 1955, Nguyen 2003a, Pham 2003) 8(10) Celastrus orbiculatus Thunb. (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 9(11) Celastrus paniculatus Willd. (Pitard 1912a, Tardieu-Blot 1948a, Hou 1955, Nguyen 2003a, Pham 2003) 10(12) Celastrus rosthornianus Loes. (Merrill 1938, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 11(13) Celastrus stylosus Wall. (Hou 1955)

16. Siphonodon Griff. 1(92) Siphonodon celastrineus Griff. (Pitard 1912b, Tardieu-Blot 1948c, Nguyen 2003b, Pham 2003), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 227, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

6. Glyptopetalum Thwaites 1(31) Glyptopetalum annamense Tardieu 2(32) Glyptopetalum calyptratum Pierre 3(33) Glyptopetalum chaudocense Pierre 4(34) Glyptopetalum gracilipes Pierre (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 5(35) Glyptopetalum harmandianum Pierre (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 6(36) Glyptopetalum integrifolium Q.W.Lin, Z.X.Zhang & Q.R.Liu 7(37) Glyptopetalum longepedunculatum Tardieu 8(38) Glyptopetalum poilanei Tardieu 9(39) Glyptopetalum quadrangulare Prain ex King (Savinov 2014) 10(40) Glyptopetalum sclerocarpum (Kurz) M.A.Lawson (Hoang 2008, Pham 2003, Savinov et al. 2018) 11(41) Glyptopetalum thorelii Pit. (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 12(42) Glyptopetalum tonkinense Pit., Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on pages 225-226, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

7. Gymnosporia (Wight & Arn.) Benth. & Hook. f. 1(43) Gymnosporia bonii Pit. 2(44) Gymnosporia chevalieri Tardieu 3(45) Gymnosporia crassifolia Pit. 4(46) Gymnosporia diversifolia Maxim. (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 5(47) Gymnosporia marcanii Craib (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 6(48) Gymnosporia mekongensis Pierre 7(49) Gymnosporia stylosa Pierre 8(50) Gymnosporia tonkinensis Pit. 9(51) Gymnosporia wallichiana (Spreng.) M.A.Lawson (Pitard 1912a, Tardieu-Blot 1948a, Nguyen 2003a), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 226, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

3. Celastrus L. 1(3) Celastrus annamensis Tardieu 2(4) Celastrus gemmatus Loes. (Merrill 1938, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 3(5) Celastrus glaucophyllus Rehder & E.H.Wilson (Hou 1955) 4(6) Celastrus hindsii Benth. (Pitard 1912a, Tardieu-Blot 1948a, Hou 1955, Nguyen 2003a, Pham 2003) 5(7) Celastrus hirsutus Comber (Hou 1955) 6(8) Celastrus hookeri Prain (Merrill 1938, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 7(9) Celastrus monospermus Roxb. (Merrill 1938, Tardieu-Blot 1948a, Hou 1955, Nguyen 2003a, Pham 2003) 8(10) Celastrus orbiculatus Thunb. (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 9(11) Celastrus paniculatus Willd. (Pitard 1912a, Tardieu-Blot 1948a, Hou 1955, Nguyen 2003a, Pham 2003) 10(12) Celastrus rosthornianus Loes. (Merrill 1938, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 11(13) Celastrus stylosus Wall. (Hou 1955), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 225, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

10. Microtropis Wall. ex Meisn. 1(59) Microtropis apiculata Ding Hou 2(60) Microtropis cerocarpa Savinov & Nuraliev 3(61) Microtropis chlorocarpa Merr. & F.L.Freeman 4(62) Microtropis discolor (Wall.) Wall. ex Meisn. (Merrill & Freeman 1940, Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003) 5(63) Microtropis fallax Pit. 6(64) Microtropis osmanthoides (Hand.-Mazz.) Hand.-Mazz. (Nguyen 2003a, Pham 2003) 7(65) Microtropis pallens Pierre 8(66) Microtropis petelotii Merr. & F.L.Freeman 9(67) Microtropis rhynchocarpa Merr. 10(68) Microtropis tetragona Merr. & F.L.Freeman (Nguyen 2003a) 11(69) Microtropis triflora Merr. & F.L.Freeman (Nguyen 2003a), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 226, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

5. Euonymus L. 1(15) Euonymus acanthoxanthus Pit. 2(16) Euonymus balansae Sprague 3(17) Euonymus cochinchinensis Pierre 4(18) Euonymus eberhardtii Tardieu 5(19) Euonymus fortunei (Turcz.) Hand. -Mazz. (Ma 2001) 6(20) Euonymus glaber Roxb. (Pitard 1912a, Tardieu-Blot 1948a, Ma 2001, Nguyen 2003a, Pham 2003) 7(21) Euonymus grandiflorus Wall. (Ma 2001) 8(22) Euonymus indicus B.Heyne ex Wall. (Pitard 1912a, Ma 2001, Nguyen 2003a, Pham 2003) 9(23) Euonymus japonicus Thunb. (Pitard 1912a, Ma 2001, Nguyen 2003a, Pham 2003) 10(24) Euonymus laxiflorus Champ. ex Benth. (Pitard 1912a, Tardieu-Blot 1948a, Ma 2001, Nguyen 2003a, Pham 2003) 11(25) Euonymus nitidus Benth. (Pitard 1912a, Ma 2001, Nguyen 2003a, Pham 2003) 12(26) Euonymus petelotii Merr. 13(27) Euonymus pittosporoides C.Y.Cheng ex J.S.Ma (Ma 2001) 14(28) Euonymus pseudovagans Pit. 15(29) Euonymus salicifolius Loes. (Ma 2001) 16(30) Euonymus tonkinensis (Loes.) Loes.

15. Salacia L. 1(77) Salacia chinensis L. (Pitard 1912b, Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003) 2(78) Salacia cochinchinensis Lour. 3(79) Salacia dongnaiensis Pierre 4(80) Salacia gagnepainiana Tardieu 5(81) Salacia godefroyana Pierre 6(82) Salacia laotica Pit. (Tardieu-Blot 1948b, Nguyen 2003a) 7(83) Salacia macrophylla Blume (Nguyen 2003a) 8(84) Salacia noronhioides Pierre 9(85) Salacia pallens Pierre (Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003) 10(86) Salacia phuquocensis Tardieu 11(87) Salacia rostrata Pierre 12(88) Salacia typhina Pierre 13(89) Salacia verrucosa Wight (Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003) 14(90) Salacia viminea Wall. (Nguyen 2003a, Pham 2003) 15(91) Salacia viridis Craib (Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 227, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

14. Reissantia N.Hall�� 1(75) Reissantia indica (Willd.) N.Hall�� (Pitard 1912b, Tardieu-Blot 1948b, Nguyen 2003a, Pham 2003) 2(76) Reissantia setulosa (A.C.Sm.) N.Hall�� (Tardieu-Blot 1948b, Nguyen 2003a), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 227, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

8. Loeseneriella A.C.Sm. 1(52) Loeseneriella chesseana (Pierre) Tardieu 2(53) Loeseneriella dinhensis (Pierre) A.C.Sm. 3(54) Loeseneriella merrilliana A.C.Sm. (Tardieu-Blot 1948b, Nguyen 2003a) 4(55) Loeseneriella pauciflora (DC.) A.C.Sm. (Nguyen 2003a, Pham 2003), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 226, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

12. Plagiopteron Griff. 1(72) Plagiopteron suaveolens Griff. (Chinh et al. 2016, Nghiem et al. 2017), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 226, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

1. Arnicratea N.Hall�� 1(1) Arnicratea cambodiana (Pierre) N.Hall��, Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 225, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

17. Tripterygium Hook. f. 1(93) Tripterygium wilfordii Hook. f. (Hai et al. 2021) Note added in proof: Bhesa was transferred to the family Centroplacaceae (Malpighiales) based on molecular phylogenetic data (Stevens 2001 onwards, etc). SUPPLEMENTARY MATERIAL ONLINE SUPPLEMENTARY FILE S1. An updated checklist of Celastraceae in Vietnam: an extended version with references to protologues, synonymy, reference(s) for occurrence in Vietnam, links to species profiles in the taxonomic databases, and brief notes on taxonomy and distribution. Available at: https://doi.org/10.5281/zenodo.6125317, Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on page 227, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842

13. Pleurostylia Wight & Arn. 1(73) Pleurostylia cochinchinensis Pierre 2(74) Pleurostylia opposita (Wall.) Alston (Tardieu-Blot 1948a, Nguyen 2003a, Pham 2003), Published as part of Pham, Ngoc Hoai, Ren, Ming-Xun, Nuraliev, Maxim S., Trinh, Ngoc Bon, Nguyen, Tien Dat, Ragupathi, Gopi & Pham, Van The, 2022, The genus Parnassia in Vietnam, and a checklist of Vietnamese Celastraceae, pp. 213-227 in Phytotaxa 536 (3) on pages 226-227, DOI: 10.11646/phytotaxa.536.3.2, http://zenodo.org/record/6331842