Tree or shrub 1–10 m high, prickly, erect, spreading or contorted. Young stems commonly hispid. Stipules persistent, prominent, spine-like or setaceous, commonly rigid, 1–3 mm long. Phyllodes crowded, sessile, linear, lanceolate or subulate, 1–4 cm long, 1.5–4 mm wide, pungent, mostly glabrous, with 3–5 veins; upper vein becoming marginal towards apex of phyllode; gland absent. Inflorescences with peduncles 3–12 mm long; spikes dense, 1.5–5 cm long, commonly exceeding phyllodes; bracteoles stipitate, navicular, 0.6–1 mm long, pubescent. Flowers 4-merous; sepals united. Pods cylindrical or slightly compressed, 6–11 cm long, 4–8 mm wide, woody, longitudinally wrinkled. Seeds elliptic, 3.5–5 mm long; funicle short, thick, folded 2 or 3 times; aril turbinate.
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