Shrub to 3 m high and 2 m wide, intricate, prickly, erect or prostrate. Stipules persistent, slightly curved, c. 1–2 mm long, sharp, rigid, shining, brown. Phyllodes often quadrangular, triangular or flattened, slightly contracted at base, hardly terete, (7–) 10–30 mm long, 1.2–2 mm wide, pungent, rigid, mostly dark green; veins mostly 3–6 in all, equally prominent; gland inconspicuous, basal; pulvinus absent. Inflorescences with peduncles 1.0–2.0 mm long; spikes commonly solitary, 0.5–1 cm long, 6–15-flowered; bracteoles cupulate or almost so; margins fimbriate. Flowers 4-merous, deep yellow; sepals united. Pods linear, slightly constricted between seeds, markedly curved or coiled, to 5.5 cm long and 2.5 mm wide, firmly chartaceous, strongly veined longitudinally. Seeds elliptic, 3-4 mm long; funicle folded 3 or 4 times; aril turbinate.
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