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Leaves 3.5–20 cm long; rachis glabrous, occasionally aculeate; petioles 0.3–1.7 cm long; leaflets in 8–41 pairs, 4–16 × 1.75–4.5 mm, oblong, apiculate, slightly broader and asymmetrical at the base, glabrous; stipules 3–7 mm long, narrowly triangular to lanceolate, caducous to ± persistent.
Pod (2.4)7.2–11.5 (rarely 13.5) cm × (2)2.5–3(5.5) mm, erect, moniliform, shortly stipitate and beaked, (2)8–18(rarely 26)-seeded; septa 5–6 mm apart; sutures 1.5 mm wide, purplish-green, distinctly darker than the valves which, particularly when immature, have a secondary sutural ridge.
Racemes 0.3–3.5(9) cm long, (1)2–8(17)-flowered; peduncle 0.1–0.9(1.8) cm long, glabrous; pedicels 0.3–1.5 cm long, glabrous; bracts 2–3 mm long, linear-lanceolate, caducous; bracteoles 1–2 mm long, linear, located slightly below the hypanthium, caducous.
Calyx 3–4.5 × 3–4 mm, the tube glabrous with 5 vertical dark brown bands each running into a tooth; teeth 0.5–0.75 mm long and well-spaced often giving the calyx a ± truncate appearance, acuminate, woolly at the margins.
Seeds brown or blackish, 2–3.3 × 2 mm, 1.5–2 mm thick, ellipsoid or ± spherical with a subcentral hilum in a very small circular pit.
Ovary 15–26(32)-ovulate, glabrous; style glabrous.
Stems glabrous, usually sparsely aculeate.
A much-branched annual herb, 1–2.5 m tall.