Most members of the south-western Australian genus Hypocalymma (Endl.) Endl. have seeds with a shallowly to very deeply pitted testa. Two small groups of species, both revised here, differ in having a smooth or colliculate testa. Both groups occur in humid environments in the extreme south-west of Western Australia and show vegetative adaptations consistent with this habitat preference. The larger group, Hypocalymma sect. Cardiomyrtus Schauer, is reinstated. A new combination, H. minus (Strid & Keighery) Keighery, is made, bringing the total species recognised to five, and lectotypes are selected for two synonyms, H. boroniaceum F.Muell. ex Benth. and H. hypericifolium Benth. The other group is extremely rare, consisting of the possibly extinct species H. connatum Strid & Keighery, and a new species known from a single population, H. verticillare Rye. The latter group, named here as Hypocalymma sect. Verticilla Rye, is readily distinguished by its 3-ridged young stems and consistently whorled leaves, and the new species is unusual in having extreme differences in the sizes of the anthers on different stamens within each flower. Molecular data indicate that sect. Verticilla is sister to sect. Cardiomyrtus. Evidence of taxonomic relationships is also presented from studies of hybridisation and insect associations.
All of these species are endemic in south-west Western Australia and are considered endangered under the Western Australian Wildlife Conservation Act 1950.
In this taxonomic review of the Calytrix acutifolia (Lindl.) Craven species complex we recognise four species, one of which (C. retrorsifolia Nge & Keighery) is described as new. Lhotskya hirta Regel is recombined into Calytrix Labill. as C. hirta (Regel) Nge & K.R.Thiele, while L. scabra Turcz. is recombined as C. cravenii Nge & K.R.Thiele. Calytrix acutifolia s. str. is recircumscribed as the fourth member of the complex.
Lyons M.N. and Keighery, G.J. A new species of Tribonanthes (Haemodoraceae) from saline wetland margins in Western Australia. Nuytsia 16(1): 77-80 (2006). A new species, Tribonanthes minor, is described and illustrated. The new species is confined to the sandy margins of primary saline lake systems in southern Western Australia.
Logania wendyae Cranfield & Keighery, a new species endemic to the Jarrah Forest bioregion of south-western Western Australia is described, illustrated and mapped.
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