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Grevillea gilmourii Olde and G. milleriana Olde, two species new to science, are described. They are putative members of the Aspleniifolia/Hookeriana Subgroup of the Grevillea Pteridifolia Group. Grevillea gilmourii is separated from G. macleayana (McGill) Olde & Marriott where it had previously been treated as the ‘Deua form’, a geographically disjunct, divided-leaf variant. The separate formal recognition of G. gilmourii here necessitates a revised delineation of G. macleayana to restrict it to populations with undivided leaves only, incorporating recent clarification to terminology in relation to leaf lobing. Grevillea milleriana is a recent discovery from the Maddens Plains area, south of Sydney. Known from a single plant, its recognition as a biological species rather than as a self-sown hybrid is discussed. All three species are linked morphologically and historically to the Victorian species G. barklyana F.Muell. ex Benth., which remains taxonomically unaltered from recent treatments. For the sake of convenience, all four species (G. barklyana, G. macleayana, G. gilmourii and G. milleriana) are grouped informally into an alliance, the Grevillea barklyana alliance, for which diagnostic characters are outlined and two identification keys are given. Both newly described species have divided leaves and are known from only small populations. Conservation recommendations are provided for both new species.

Twenty-one Grevillea species currently comprise the Triloba Group sensu Flora of Australia, or Group 1 sensu The Grevillea Book. All species except the transcontinental species G. anethifolia R.Br. are distributed in south-west Western Australia. Grevillea pieroniae Olde, herein described, is currently treated as Grevillea sp. Stirling Range (D.J. McGillivray 3488 & A.S. George) by the Western Australian Herbarium. It has some affinity with Grevillea anethifolia through shared possession of similar truncate-conical to cylindrical pollen-presenters. Grevillea pieroniae is a rare species that is potentially threatened by Phytophthora cinnamomi, fire frequency, a drying climate, as well as feral and native herbivore-grazing, so requires careful assessment and ongoing monitoring. A short history of the Triloba Group is provided to give context to Grevillea pieroniae and as precursor to other related species soon to be recognised.

The correct citation for Grevillea manglesii (Proteaceae) is G. manglesii Pépin (1838). A neotype is here selected from among historic collections, now at Paris (P). Should the minimal description provided by Pépin be successfully challenged as inadequate, the name would not change but the revised authority would be Grevillea manglesii (Graham) A.Baumann and N.Baumann (1843). The origins and complex taxonomic and horticultural history of G. manglesii and its synonyms Manglesia glabrata Lindl., Anadenia manglesii Graham, Grevillea manglesii Hort., Manglesia trilobata Hort. ex Ettingsh., and Manglesia cuneata Endl. are outlined and discussed, together with new insights discerned from James Mangles’ unpublished Letter Books. The important role of Captain James Mangles R.N. to the botany and horticulture of Grevillea manglesii is reviewed and historical errors are corrected. Manglesia glabrata Lindl. is lectotypified. G. ornithopoda Meisn. is reinstated at specific rank and G. dissectifolia (McGill.) Olde is published as a new combination. Both are phenetically diagnosable without intergrades and occur in discrete populations that sometimes overlap the distribution of related species.

Grevillea speckiana Olde is described from a single collection gathered in 1953. Although the specimens bears flowers in early bud, fruits and foliage are sufficient to assign and describe the species. Unlike several other species in the Triloba Group awaiting description from single specimens that represent extinct species, there is some hope for its continued existence because of the botanically unexplored locality in which it was collected.

The existence of Grevillea merceri Olde & Marriott, herein described, was brought to light following a single collection by the late Ken Newbey in 1963. His specimen was treated by McGillivray and Makinson (1993: 187) as ‘unassignable to species’ but with possible affinity to G. paniculata Meisn., a species very broadly conceptualised in their work. Revision and a more restricted delimitation of G. paniculata by Olde & Marriott (1994, 1995) clarified the many significant differences from this specimen. The relationship of G. merceri to other members of the Triloba Group however remains uncertain and awaits phylogenetic analysis.

Grevillea hortiorum Olde, a species in the Triloba Group sensu Flora of Australia (2000), is here described for the first time. Its nearest relative is certainly also a member of the Triloba Group, based on shared morphological characters, and it may be related to Grevillea acrobotrya Meisn. Numerous morphological differences distinguish it, but it has not been tested phylogenetically. Subsequent to its initial discovery when it was thought to be rare, both its distribution and population have been greatly expanded, almost exclusively due to the efforts of its eponymous collectors. It was initially thought to be uncommonly associated with open wandoo woodland but later collections have been gathered in open heath as well. An interim key to the species is provided.

Grevillea trichantha Olde, a rare species in the Triloba Group is described. It was discovered by the author in 2001 and appears to be most closely related to G. metamorpha Makinson, a rare, allopatric species known only from a single population on private land, west of the Brand Highway, in south-west Western Australia. Grevillea trichantha is the third species in the Triloba Group bearing floral organs on which hairs in various degrees of density are consistently distributed, notably on the outer surface of the perianth. A short key differentiating the three species is provided. Grevillea trichantha is more common than its comparator, G. metamorpha, but is still highly localised in distribution so deserves high conservation priority.

A preliminary checklist of more than 360 fossil plants in the Proteaceae is presented, together with details of their publication. The list includes only current and synonymised genera in which extant species are or were recognised. The aim is to reduce the likelihood of new names being taken up with earlier homonyms, ultimately necessitating unfortunate name changes. Lomatia fraxinifolia F. Muell. ex Benth. is an illegitimate homonym and is here replaced with the name Lomatia milnerae Olde. Grevillea trilobata (Hort ex Ettingsh.) Olde, comb. nov., previously incorrectly treated as a fossil, is here recognised as a probable synonym of Grevillea manglesii (Graham) Planch. Hakea salisburiifolia Hügel ex Ettingsh. is recognised as an extant species and treated as a synonym of Hakea baxteri R.Br.

The recent recognition of Triunia kittredgei Olde (Olde 2015) has been challenged by G.P. Guymer and P. Forster (2015) who have suggested that the name should be rejected and that the application of previous names should continue to apply in the genus Triunia L.A.S.Johnson & B.G.Briggs. They have argued that two varietal lectotypifications in Helicia youngiana C.Moore & F.Muell. by H. Sleumer (1955), varieties later recognised as species in the genus Triunia, should be overturned in favour of two later lectotypifications by D. Foreman (Foreman 1986). Their arguments are here separately examined and refuted.

The name Triunia kittredgei P.M. Olde replaces Triunia robusta sensu D. Foreman (1986) following an invalid lectotypification. Triunia erythrocarpa Foreman is referred to synonymy under Triunia robusta, correctly applied. The lectotypes of T. robusta and T. montana were apparently not distributed to NSW as indicated by Sleumer (1955) and replacements are here redesignated from among the existing isolectotypes. The holotype of Triunia youngiana was not collected by Charles Moore as indicated by Moore and Mueller (1864), and Sleumer (1955) who typified the name with Moore’s collection number 4 at MEL. The evidence points to the collection Richards 4 as the holotype.

A morphological study of living plants and herbarium specimens has here resulted in the formal recognition of two parapatric subspecies in Grevillea laurifolia Sieber ex Spreng., the autonymic subsp. laurifolia, and the novel subsp. caleyana P.M.Olde. Some critical phenetic characters show a strong morphological approach in specimens collected around Wentworth Falls which suggests that this area is a narrow geographic zone where the two subspecies intergrade. Notwithstanding the morphological approach all specimens examined were classifiable in one or other subspecies on the basis of their pistil lengths. A key to the subspecies of Grevillea laurifolia, descriptions of all taxa discussed, notes on conservation status and distributional information are provided.

781 Olde, Peter M.l & Molyneux W.M.2, (1138 Fowler Rd., Illawong, NSW 2234, Australia; 2p.o. Box 386, Yarra Glen, VIC 3775, Australia). 1994. Delimitation of two new species from the Grevillea victoriae alliance (Proteaceae: Grevilleoideae). Telopea 5(4): 781-787. McGillivray (1993) has submerged much population-based diversity in a broadly circumscribed Grevillea victoriae F. Muell. The G. victoriae complex is partially resolved by the delimitation of the new species G. hockingsii W. Molyneux & P. Olde from south-eastern Queensland. G. mollis P. Olde & W. Molyneux from the Northern Tablelands of New South Wales is also described.

aIde, Peter M.l & Marriott, Neil R.2 (1138 Fowler Rd., IlIawong, NSW Australia 2234; 2 PO Box 107, Stawell VIC Australia 3377) 1994. Grevillea buxifolia (Proteaceae: Grevilleoideae) revisited. TeIopea 5(4): 707-710. Grevillea buxifolia (Sm.) R. Br. sensu McGillivray is re-examined. One new subspecies, G. buxifolia subsp. ecornicuIata P. OIde & N. Marriott is recognised and described. G. sphacelata R. Br. is reinstated at specific rank.

399 Olde, Peter M. (138 Fowler Rd, Illawong, NSW, Australia 2234) & Marriott, Neil R. (White Gums Nursery, Deep Lead, VIC, Australia 3377). A taxonomic revision of Grevillea angulata (Proteaceae: Grevilleoideae) and closely related species from the Northern Territory and Western Australia. Telopea 5(2): 399-417. Three new species of Grevillea (G. aurea, G. brevis and G. glabrescens) are separated from G. angulata R.Br. One new species (G. microcarpa) is separated from G. agrifolia A. Cunn. ex R. Br. G. angulata var.? lancifolia F. Muell. ex Benth. is referred to synonymy under G. brevis. Notes on affinities and distribution are included as well as a key to the group.