Tall shrub or tree 2–8 m high. Branchlets sometimes angular or flattened at extremities, glabrous, pruinose or not. Phyllodes dimorphic: on young plants widely spreading, broadly elliptic to obovate, 1.3–7.5 cm long, 13–25 mm wide; on mature plants erect, oblanceolate, elliptic to narrowly elliptic, mostly straight, acute, 4.5–10 (–12) cm long, usually 7–13 mm wide, pale green to greyish or subglaucous, normally glabrous; longitudinal veins numerous, fine and close together, 3–5 more prominent than the rest, anastomoses absent; minor veins 4–8 per mm; pulvinus 0.5–3 mm long; glands absent or 1 near distal end of pulvinus. Inflorescences simple or rudimentary racemes 1–3 mm long; peduncles 0–2 mm long, coarsely longitudinally furrowed (dry), glabrous or rarely sparsely appressed-hairy at base; spikes 1.5–4 cm long, pale yellow, densely flowered; ovary hairy. Flowers 5-merous; calyx gamosepalous, very shortly dissected into triangular lobes, c. ⅓ length of corolla, lanate to tomentose especially at base. Pods linear or sub-moniliform, 3.5–9 cm long, 2–4 mm wide, ±curved, thinly textured, longitudinally wrinkled (dry), glabrous, ±pruinose. Seeds longitudinal, elliptic, dark brown to black, arillate.
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