Shrub or small tree, 1.5–8 m high. Bark peeling in short flakes, fibrous below, grey-brown, dark brown or reddish brown. Branchlets not markedly triquetrous, becoming terete, light brown to reddish brown, glabrous, often pruinose. Phyllodes dimorphic: mature phyllodes mostly narrowly elliptic to very narrowly elliptic, usually scarcely curved, 3.5–10 cm long, 7–15 (–23) mm wide, with acute apex and subglobose mucro, coriaceous, glabrous (young growth reddish black and viscid), often glaucous, with 3 obscure or subprominent longitudinal veins separate to base, mostly with 4–7 nonanastomosing minor veins per mm; gland inconspicuous, basal; pulvinus 1.4–3 mm long; phyllodes on young growth shorter and broader, ± elliptic, straight. Inflorescences racemose; raceme axes (1–) 3–9 (–12) mm long. Spikes 2, sometimes 1 on leafy axillary shoots, 3–5.2 cm long, dense, bright yellow. Flowers 5-merous; calyx 0.4–0.7 mm long, nearly truncate or dissected to ⅕ of length, densely pubescent to villous, not scurfy; corolla 1.5–1.8 mm long, dissected to c. ⅓ of length; petals acute, glabrous; ovary glabrous. Pods linear, submoniliform, flat or almost so, straight or curved, 2–9.5 cm long, 3–5 mm wide, thinly coriaceous, finely striate, glabrous. Seeds longitudinal, 4–5 mm long, dark brown to black; areole open.
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