Acacia costata Benth., London J. Bot . 1: 339 (1842)
Spreading shrub normally 0.2–0.5 m high. Branchlets ribbed, tomentulose to woolly, glabrescent. Stipules setaceous, 1.5–3 mm long. Phyllodes subsessile, patent, inequilateral, narrowly lanceolate, straight or shallowly recurved, 6–15 mm long, 1.5–2.5 mm wide, acuminate, pungent, rigid, green, often sparsely tomentulose on nerves, 5-nerved, the 2-nerved adaxial margin convex, thick and nerve-like; midrib prominent and near the non-thickened abaxial margin. Inflorescences simple, 1 per axil; peduncles 5–12 mm long, sparsely to densely appressed-puberulous; heads globular, rather loosely 13–19-flowered, golden; bracteoles dark brown, tomentulose; buds large. Flowers 5-merous; sepals united at base, dark brown, tomentulose; petals striate, glabrous. Pods curved, terete, to 5 cm long, 4–4.5 mm diam., dark reddish brown, obscurely striate, minutely appressed-puberulous. Seeds longitudinal, c. 5 mm long; aril terminal, conical.
Occurs in an area between Walebing, Calingiri and Cataby with an early collection from near Perth, south-western W.A. Grows in sand or laterite, commonly in low heath.
The Drummond specimens with flowers resembling A. divergens which are noted by G.Bentham, Fl. Austral . 2: 327 (1864) under A. costata , are A. acutata .
Most closely related to A. barbinervis . Resembling A. rigida in phyllodes and pods.
Type of accepted name
Swan R., W.A., J.Drummond s.n .; holo: K.
Illustration
M.Simmons, Acacias Australia 187 (1981).
Representative collections
W.A.: 10 km S of Calingiri, P.Hussey 15 (PERTH); 28 km W of Mogumber on Mogumber West Rd to Brand Hwy, B.R.Maslin 5480 (CANB, PERTH); sand near Perth, A.Oldfield s.n . (K).
(BRM)
The information presented here originally appeared on the WATTLE CD-ROM which was jointly published by the Australian Biological Resources Study, Canberra, and the Department of Parks and Wildlife, Perth; it was produced by CSIRO Publishing from where it is available for purchase. The WATTLE custodians are thanked for allowing us to post this information here.
