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Acacia barbinervis

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Acacia barbinervis Benth., London J. Bot . 1: 326 (1842)

Spreading, multistemmed shrub 0.2–0.4 m high. Branchlets glabrous or puberulous to pubescent. Stipules linear-triangular to setaceous, 1.5–4.5 mm long. Phyllodes sessile and linear, flat but appearing angular when narrow due to raised nerves, 1–3 cm long, 1–2 mm wide, with oblique and pungent apex, rigid, green, glabrous or hairy, 5-nerved, the 2-nerved adaxial margin thick and nerve-like; midrib prominently raised, central or near lower margin. Inflorescences simple or rudimentary racemes with axes <0.5 mm long, 1 or 2 per axil; peduncles 5–14 mm long, glabrous or hairy; heads globular, 12–22-flowered, golden or creamy yellow; bracteoles acuminate. Flowers 5-merous; sepals 1/2–3/4 united; petals striate. Pods curved, terete to subterete, to 7 cm long, c. 4 mm wide, coriaceous to thinly crustaceous, red-brown, longitudinally nerved, glabrous or puberulous. Seeds longitudinal, oblong, 5.5–6 mm long; aril terminal, conical.

Closely related to A. costata which is distinguished by its narrowly lanceolate, normally shorter phyllodes.

Occurs in south-western W.A. from near Eneabba S to Waroona. A summer flowering species. Two subspecies are recognised.

Phyllodes some or all shallowly recurved; branchlets acutely angled at apices; flower-heads golden

subsp. barbinervis

Phyllodes straight to shallowly incurved; branchlets scarcely angled; flower-heads creamy yellow

subsp. borealis


Acacia barbinervis Benth. subsp. barbinervis

Branchlet apices acutely angled. Stipules inclined to ascending, mostly shallowly recurved. Phyllodes inclined to ascending, shallowly recurved, a few straight, flat with a nerve-like upper margin; cusp 1–2 mm long; midrib near lower margin; gland normally absent; pulvinus absent. Flower-heads golden. Flower buds apiculate. Calyx dissected for c. 1/4 its length, with lobes broadly triangular.

Occurs in the Darling Ra. from near Bindoon and Toodyay S to Waroona, south-western W.A. Grows in lateritic soil in Jarrah- Marri woodland and forest.

Type of accepted name

Swan R., W.A., 1839, J.Drummond s.n .; holo: K; iso: K, PERTH.

Representative collections

W.A.: Waroona, Diels & Pritzel 154 (PERTH); E of Bullsbrook East, B.R.Maslin 4801 (CANB, K, PERTH); Julimar Rd, Toodyay, 5 Jan. 1992, P.A.Phillips (PERTH); prope cataractam ad caput fluvii Cygnorum [Susannah Brook], L Preiss 988 (C, CGE—sphalm. ‘847’, FI, G, GOET, HBG, K, L, LUND, M, MO, NAP, NY, P, RO, STR, TCD—sphalm. ‘847’).


Acacia barbinervis subsp. borealis Maslin, Nuytsia 12: 327 (1999)

Branchlet apices scarcely angled. Stipules ascending to erect, straight. Phyllodes ascending to erect, straight to shallowly incurved, flat with a nerve-like upper margin but appearing angled in section when narrow due to pronounced nerves; cusp 0.5–1 mm long; midrib central; gland 2–12 mm above pulvinus; pulvinus 0.5–1 mm long. Flower-heads creamy yellow. Flower buds rounded-obtuse. Calyx dissected for c. 1/2 its length, with lobes narrowly triangular.

Near-coastal areas from near Eneabba S to Wanneroo, south-western W.A. Grows mostly in sand in open heath and low Banksia woodland.

Perhaps warrants species status.

Phyllodes resemble those of A. laricina which are continuous on the branches, also the petals of A. laricina are not striate. Superficially resembles the quadrangular phyllode variant of A. auronitens which has 4-nerved phyllodes, thickly crustaceous to woody pods and smaller, mottled seeds.

Type of accepted name

Near Victoria location 10212, 22 km N of Eneabba, W.A., 2 Jan. 1979, E.A.Griffin 1802 ; holo: PERTH.

Representative collections

W.A.: 2.5 km SSW of Yeal Swamp, Wanneroo Forest Reserve, Y.Chadwick 2527 (PERTH); 8 km S of Eneabba, E.A.Griffin 796 (K, PERTH) and 835 (CANB, PERTH).


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: Thursday 22 June 2023