Acacia semicircinalis Maiden & Blakely, J. & Proc. Roy. Soc. W. Australia 13: 11; pl. 8, figs 1–5 (1928)
Diffuse shrub to 1 m high. Branches wiry and often prostrate (not dividing into short, divaricate branchlets), sometimes coarsely pungent, minutely verruculose at least at extremities, glabrous or hispidulous. Phyllodes oblong-elliptic to narrowly oblong-elliptic, sometimes lanceolate or circular, 1–2 cm long, 5–10 mm wide, l:w = 1.5–3, inequilateral at base, undulate, acute to obtuse and excentrically apiculate, sometimes coarsely pungent, sometimes subglaucous, glabrous or hirtellous with hairs often tubercle-based and confined to margins, 1-nerved per face; lateral nerves obscure. Inflorescences mostly simple and within axils of immature phyllodes at ends of branches; peduncles 5–13 mm long, glabrous or subglabrous; heads globular, c. 25-flowered, golden. Flowers normally 5-merous; sepals free, linear-spathulate. Pods narrowly oblong, shallowly arcuate, raised over but scarcely constricted between seeds, to 6 cm long and 6 mm wide, glabrous. Seeds longitudinal, oblong-elliptic, c. 6 mm long, arillate.
Restricted to the Wongan Hills, W.A. Gazetted a rare species in W.A. Grows on hills in lateritic, often gravelly, soil on hills in Mallee and Acacia shrubland.
Sympatric with, and often confused with a related species, A. botrydion , which is a harsher, intricately branched shrub to 1.3 m high with terminal clusters of racemes or panicles that appear much later in the year and coiled pods (see B.R.Maslin, Nuytsia 4: 32 (1982), for discussion). Also sometimes confused with A. aculeiformis .
Type of accepted name
Wongan Hills, W.A., 3 Oct. 1903, A.Morrison s.n .; lecto: NSW, fide B.R.Maslin, Nuytsia 4: 34 (1982); isolecto: K.
Representative collection
W.A.: NW of Wongan Hills [township] towards Piawaning, R.Coveny 7841 & B.R.Maslin (K, CANB, NSW, PERTH).
(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.
