Slender shrub or tree 2–10 (–14) m high, with pendulous branches. Bark corky, fissured. Branchlets smooth, glabrous or hairy, becoming corky with furrows. Stipular spines 0.5–6.5 mm long, often inconspicuous. Leaves: petiole 1.2–7.5 cm long, glabrous or hairy, with minute gland at base of lowest pair of pinnae; rachis (0.5–) 1–11.2 (–18) cm long, glabrous or hairy, with minute gland at base of all or some pairs of pinnae; pinnae 1–11 pairs, often curved, 4–13.5 (–19.8) cm long; pinnules (8–) 15–54 pairs, mostly well-spaced, narrowly oblong to cultrate, elliptic to narrowly elliptic, narrowly obovate to oblanceolate or narrowly lanceolate, sometimes curved, 3–35 mm long, 1.5–9.5 mm wide, glabrous or sparsely ciliolate mainly near base, with mid-, marginal and lateral veins visible. Inflorescences simple, 1–4 in axils, or in clusters of 2–4 (sometimes single) that are widely separated on a (?)terminal, leafy axis to c. 20 cm long (appearing raceme-like due to leaf loss); peduncles 8–55 mm long, with involucel of bracts (½–) ⅔ way or above (rarely near) base; heads globular, 19–34-flowered, white or cream-coloured to very pale yellow. Pods cultrate to linear or sometimes ±narrowly elliptic, ±straight-sided or constricted between seeds, flat or slightly raised over seeds, (4–) 6–18.3 cm long, 8–15 (–17.5) mm wide, coriaceous to thinly woody, ±longitudinally veined, glabrous or puberulous.
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