Shrub 0.2–1.5 m high. Branchlets often spinose, with indumentum variable. Axillary spines 1 per node, sometimes few or absent, 3–12 mm long. Pinnae 1 pair, 1–10 mm long; petiole to c. 0.5 mm long; pinnules 2–8 pairs, 1–5 mm long, 0.5–1 mm wide, usually recurved to revolute, usually green, glabrous to hirsutellous; gland within axil of pinnae, stipitate, to 0.5 mm long. Inflorescences rudimentary 1 (or 2)-headed racemes; peduncles 2–12 mm long, with indumentum variable; heads usually globular, 16–50-flowered, golden; bracteoles acute to long-acuminate. Flowers 5-merous; sepals ½–¾-united. Pods flat or undulate, 1–4 cm long, 3–5 mm wide, glabrous or puberulous to pubescent. Seeds longitudinal to transverse, oblong to elliptic or circular, 1.5–2.5 mm long, sometimes mottled.
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