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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.

Dodonaea crucifolia I.Telford & J.J.Bruhl (Sapindaceae, Dodonaeoideae), endemic to north-eastern New South Wales, Australia, and previously confused with D. hirsuta (Maiden & Betche) Maiden & Betche, is described as new. Dodonaea hirsuta is recircumscribed with the D. crucifolia components removed and with male flowers described for the first time. The distribution, habitat and conservation status of both species are discussed and a table is provided comparing selected morphological attributes. Images of the new species and D. hirsuta are provided. The identification keys in Flora of Australia and NSW FloraOnline are modified to include the new species.

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.

The genus Mesochaete Lindb. is known from tropical to temperate regions of the east coast of mainland Australia and Lord Howe Island. It includes two species, M. undulata Lindb. and M. taxiforme (Hampe) Watts & Whitel. Leaf size, leaf cell dimensions and aspects of leaf cross-sectional anatomy appear to be the most reliable morphological features to distinguish the species and new information is given in support of their retention as separate species. Incorrect statements in the Flora of Australia and other Australian treatments are rectified. As there are no previous illustrations of the sporophyte of M. taxiforme, or descriptions of the peristome and spores of either taxon, complete illustrations of the two Mesochaete species are presented with a supplementary description of the sporophyte and, where available, SEMs of peristomes and spores. One of the taxa, M. taxiforme, was represented by very little fruiting material. Consequently, only one sporophyte was sacrificed for the SEM work. Morphologically, peristomes and spores of both taxa appear almost identical.

Revised keys to the Bryaceae flora of Australia and its offshore islands are presented, including new keys to genera and to species within each genus. Sixty named species and two undetermined taxa are included in the treatments. Leptostomopsis pulchra (Hook.) Ochyra & Bedn.-Ochyra is reported from near Melbourne, Victoria as a new genus and species to Australia. Notes on each species are included, and comparisons made with the closely similar Bryaceae of New Zealand.

Species of Mitrasacme occurring in Australia were revised for the Flora of Australia project in 1996, but the genus has never been revised as a whole. A checklist of the names of Mitrasacme species that occur outside Australia is presented here, together with their taxonomic status, known distribution and notes on their morphological affinities.

Thysanotus racemoides Sirisena, T.D.Macfarl. & Conran, a new species from South Australia and western Victoria is described and distinguished from the previously conspecific T. juncifolius (Salisb.) J.H.Willis & Court, the revised distribution of which is New South Wales and eastern Victoria. Descriptions, photographic plates and a map are provided for the new species and T. juncifolius. The key in the Flora of Australia is amended to accommodate the new species.

Weston, Peter H. (National Herbarium of New South Wales, Royal Botanic Gardens, Sydney, NSW 2000, Australia) 1999. Persoonia pauciflora P.H. Weston (Proteaceae), a new species from the Hunter Va l l e y, New South Wa l e s . Telopea 8(2): 159–164. Persoonia pauciflo r a P.H. Weston, a new species from the Hunter Va l l e y, New South Wales, is described and distinguished from its closest relatives. The keys t o P e r s o o n i a that have been published recently in the Flora of New South Wa l e s and Flora of Australia a re amended to include this species.

Weston, Peter H. and Johnson, L.A.S. (National Herbarium of New South Wales, Royal Botanic Gardens, Sydney, N.S.W. 2000, Australia) 1996. Persoonia hindii (Proteaceae), a new species from the Newnes Plateau, New South Wales. Telopea 7(3): 199–203. Persoonia hindii P.H. Weston & L.A.S. Johnson, a new species from the Newnes Plateau in the Blue Mountains, New South Wales is described and distinguished from its closest relatives. The keys to Persoonia that have been published recently in the Flora of New South Wales and Flora of Australia are amended to include this species.