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Acacia semitrullata

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Acacia semitrullata Maslin, Nuytsia 2: 282; 284, fig. 7 & 326, fig. 20 (1978)

Erect shrub 0.3–0.5 m high, sometimes taller. Branches orange-brown. Branchlets antrorsely puberulous, the hairs often appressed. Stipules narrowly triangular, sometimes setaceous, 1–2 mm long, spreading, often incurved. Phyllodes patent, sometimes reflexed, narrowly semi-trullate with a slight gland-angle on adaxial margin near base, sometimes triangular-lanceolate without gland-angle, 5–10 mm long, 1.3–2 mm wide, pungent with a slender, 0.5–1.5 mm long cusp, rigid, green, glabrous or subglabrous; midrib prominent; lateral nerves absent. Inflorescences simple, 1 per axil; peduncles 3–8 mm long, densely puberulous with straight, patent hairs; heads globular, 5–8-flowered, cream to white. Flowers 4-merous; sepals c. 1/2-united, with lobes triangular; petals puberulous, 1-nerved. Pods terete, narrowed at both ends, to 7.5 cm long, 2–3 mm diam., red-brown, striate, finely appressed-puberulous. Seeds oblong, 4 mm long; aril terminal, conical.

Occurs from Yarloop S to Collie and the Whicher Ra., south-western W.A. Grows in sand in open heath frequently fringing seasonally dry swamps, and in sand over laterite in shallow depressions in open Jarrah forest.

A member of the ‘ A. horridula group’ most closely related to A. uliginosa which has sparser branchlet hairs restricted to the ribs, erect stipules, 8–15-flowered heads, and glabrous, nerveless petals.

Type of accepted name

Between Harvey and Myalup, W.A., 20 Aug. 1976, B.R.Maslin 4193 ; holo: PERTH; iso: CANB, K, MEL.

Synonymy

[ Acacia horridula auct. non Meisn. G.Bentham, Fl. Austral. 2: 350 (1864) p.p. , as to Swan R., Drummond s.n. and Harvey R., Oldfield s.n. ]

Illustrations

B.R.Maslin, Nuytsia 2: 284, fig. 7 (1978).

Representative collections

W.A.: W of Yarloop, R.J.Cranfield 121 (NSW, PERTH); Whicher Ra., A.S.George 6212 (NSW, NY, PERTH); 3.2 km SW of Donnybrook towards Capel, B.R.Maslin 448 (NSW, NY, PERTH).

(BRM)

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: Friday 13 December 2019