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Flora of Australia Online

Acacia acuminata Benth., London J. Bot. 1: 373 (1842)

T: Swan R., W.A., J.Drummond s.n. ; syn: ?K n.v. ; King Georges Sound, W.A., Bagster [W.Baxter] ; syn: n.v.

Shrub or tree to 12 m high. Bark smooth to slightly rough, grey. Branchlets ±terete, usually grey, glabrous. Young shoots pale yellow- to golden-villous or silky. Phyllodes linear to narrowly elliptic, flat, compressed-rhomboidal or terete to subterete, straight to recurved, 5–15 (–25) cm long, mostly 0.5–9 mm wide, tapered to a curved non-pungent slender apex, bright green, densely white-ciliolate especially towards apex, sometimes almost glabrous, multistriate, rarely anastomosing; midnerve often more prominent. Spikes 1 or 2 (–3) in phyllode axils, sessile or rarely with peduncles to 2 mm long, 0.5–3.5 cm long, dense, yellow to bright yellow or golden. Flowers mostly 4-merous; calyx 0.7–1 mm long, dissected by 1/2 or more, with lobes usually narrow, with rounded obtuse apices, with white or yellowish hairs mostly on base and margins and midribs; corolla 1.3–1.7 mm long. Pods linear, ±moniliform, strongly raised over seeds, straight or slightly curved, to 12.5 cm long, 4–7 mm wide, chartaceous, brown, clothed with sparse minute caducous hairs. Seeds longitudinal, oblong to broadly elliptic, sometimes almost globose, 3–6 mm long, very dark brown to brownish black; funicle folded 2 or 3 times, cream-coloured. 

Occurs widely in southern Australia from south-western W.A. to the western plains of N.S.W. Often locally abundant. Flowers July–Oct. 

A member of the ‘A. multispicata group’. There are 2 subspecies.

Since publication of the Flora of Australia the Australian Plant Census no longer recognises infraspecific taxa for this species.

(Dr M.D.Tindale and Dr P.G.Kodela with the assistance of M.Bedward, S.J.Davies, C.Herscovitch, D.A.Keith and/or D.A.Morrison)

Phyllodes 1.5–9 mm wide, flat or sometimes compressed-rhomboidal in cross section. Spikes 1–3.5 cm long

subsp. acuminata

Phyllodes 0.5–1.3 (–1.5) mm wide, terete to subterete. Spikes 0.5–1.5 cm long

subsp. burkittii

 

Data derived from Flora of Australia Volumes 11A (2001), 11B (2001) and 12 (1998), products of ABRS, ©Commonwealth of Australia