Two new species of Hibbertia (Dilleniaceae) from near Ravensthorpe in Western Australia
WEGE, J.A. AND THIELE, K.R.
Two new and geographically restricted species allied to H. hamulosa J.R.Wheeler and H. mucronata (Turcz.) Benth. are newly described. Hibbertia abyssa Wege & K.R.Thiele is distinctive for its long, slender and more or less glabrous peduncles, and sepals with both uncinate and minute stellate hairs on the outer surface. This species, which occurs on shallow soils with siltstone outcropping, is known from a single population adjacent to the nickel mine on Bandalup Hill and has recently been gazetted as Declared Rare Flora. Hibbertia atrichosepala Wege & K.R.Thiele is readily distinguished from allied species by its completely glabrous sepals. It is a narrow range endemic of rocky, lateritic habitats in in the Ravensthorpe Range and is listed as having Priority One conservation status.