Shrubs or small trees, 2-4 m tall. Branches grayish white to light brown; young branchlets puberulent, glabrescent when old. Spines not robust, long needlelike, 1.5-6.5 cm, with few, short branches. Leaves pinnate or bipinnate (pinnae 2-4 pairs), 7-16 cm; petiolules short, ca. 1 mm, puberulent; leaflets 5-12 pairs, obliquely ovate to oblong, 6-24 × 3-10 mm, thinly leathery, upper leaflets much smaller than lower ones, abaxially puberulent, adaxially glabrous, veins obscure on both surfaces, base oblique, broadly cuneate, margin entire, apex rounded. Flowers polygamous, greenish white, subsessile, fascicled, in spikes or terminal panicles. Inflorescence 5-12 cm, puberulent; bracts 3, lowest lanceolate, ca. 1.5 mm, upper 2 ovate, ca. 1 mm, pubescent. Male flowers: ca. 5 mm in diam.; receptacle ca. 1.5 mm.; sepals 3 or 4, lanceolate, 2.5-3 mm; petals 3 or 4, ovate-oblong, ca. 3 mm, as calyx lobes puberulent outside, villous inside; stamens 6-8. Bisexual flowers: ca. 4 mm in diam.; calyx lobes 4, triangular-lanceolate, 1.5-2 mm, both sides puberulent; petals 4, ovate-oblong, ca. 2 mm, outside puberulent, inside villous; stamens 4, opposite to sepals; ovary long stalked, glabrous, 1-3-ovuled. Legume reddish brown to deep brown, obliquely elliptic or obliquely oblong, flat, thin, 3-6 × 1-2 cm, glabrous, with slender beak at apex; stipe 1-2 cm. Seeds 1-3, brownish, compressed, ovoid or oblong, 7-10 × 6-7 mm, smooth. Fl. Jun-Jul, fr. Jul-Oct.
Can be grown by seedlings. Seeds needs soaking.
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