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Acacia orthotricha

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Acacia orthotricha Pedley, Contr. Queensland Herb . 11: 19 (1972)

Shrub less than 1 m high. Stems pubescent with long, spreading to reflexed or erect hairs. Stipules 0.7–1.5 mm long. Phyllodes in whorls of 7–11, slightly incurved, recurved at apex, slightly flattened and deeply sulcate above, 4–7.5 mm long, shortly mucronate, pubescent with erect hairs. Peduncles 5–10 mm long, pubescent. Heads 25–35-flowered. Flowers 5-merous; calyx 0.9–1.6 mm long, finely but distinctly ribbed, the lobes broadly triangular, obtuse, acuminate or laciniate, with some long hairs on margins; corolla lobes striate, hairy towards apex. Pods linear, to 60 mm long, 9–13 mm wide, glabrous but viscid. Seeds transverse or slightly oblique, c. 5 mm long, not seen mature.

Occurs between Mt Elizabeth Stn, Tableland Stn and Kununurra, W.A., and on Inverway Stn, N.T. Grows on plains in lateritic soil, in open shrubland.

A very distinct species with indumentum and calyx similar to A. chippendalei , but it has markedly larger flowers and heads and transverse seeds. The arrangement of the seeds suggests some affinity with A. adoxa which, however, has shorter hairs on the branchlets and phyllodes and a calyx with linear, not broadly triangular lobes.

Type of accepted name

20 miles [32 km] W of Inverway Stn, N.T., June 1952, R.A.Perry & M.Lazarides 2929 ; holo: BRI; iso: CANB, NT, PERTH.

Illustration

L.Pedley, op.cit. 3 fig. 1f.

Representative collections

W.A.: Kununurra, June 1966, A.Douglas (PERTH); Mt Elizabeth Stn, J.Petheram 425 (PERTH); 7 km NE of Tableland Stn on Marion Downs track, T.Willing 502 (PERTH). N.T.: 33 km W of Inverway Stn, G.M.Chippendale NT5943 (BRI, NT).

(ASG)

WATTLE Acacias of Australia CD-ROM graphic

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.

Page last updated: Tuesday 11 September 2018