Acacia horridula Meisn., in J.G.C.Lehmann, Pl. Preiss . 1: 9 (1844)
Shrub to c. 0.6 m high. Branchlets normally red-brown to light brown, puberulous with antrorse to patent hairs. Stipules setaceous to narrowly triangular, 2.5–4 mm long. Phyllodes often crowded, patent, narrowly semi-trullate with a prominent gland-angle on adaxial margin near base, 6–8 mm long, 1.5–2.5 mm wide, acuminate, pungent, with slender, c. 1 mm long cusp, rigid, green, glabrous; midrib prominent, central; lateral nerves absent. Inflorescences simple, 1 per axil; peduncles 5–10 mm long, puberulous; heads globular, 4-flowered, pale yellow. Flowers 4-merous; calyx gamosepalous. Pods terete, narrowed at both ends, curved, to 7.5 cm long and 3.5 mm wide, red-brown, striate, subglabrous. Seeds longitudinal, oblong, 4–5 mm long; aril terminal, conical.
Occurs in south-western W.A. in the Darling Ra. from the Helena Valley S to the Serpentine R., where it grows on rocky hillsides in Eucalyptus woodland. Also recorded from the adjacent coastal plain at Maddington.
The description of A. horridula in G. Bentham, Fl. Austral. 2: 350 (1864) is a mixture of A. horridula ( Preiss 1151 ), A. pycnocephala ( Preiss 965 ) and A. semitrullata ( Drummond s.n. and Oldfield s.n .). These species together with A. hastulata , A. inops and A. uliginosa comprise the ‘A. horridula group’, fide B.R. Maslin, Nuytsia 2: 270 (1978). Acacia rigida , A. phaeocalyx and A. plautella appear to have fairly close relationships to this group.
Type of accepted name
Canning R., Perth, W.A., 4 Dec. 1839, L.Preiss 1151 ; lecto: NY, fide B.R.Maslin, Nuytsia 2: 277 (1978); iso: G, LD, MEL, P, PERTH (Fragment ex MEL), W; paralecto: L.Preiss 965 , see A. pycnocephala .
Illustration
B.R.Maslin, op. cit ., 278, fig. 5.
Representative collections
W.A.: Serpentine, B.R.Maslin 4175 (PERTH); Maddington, 6 Aug. 1904, A.Morrison s.n . (K, PERTH); Helena Valley, end [of] Moola Rd, J.Seabrook 13 (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.
