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Leaves 2.8–24.5 cm long; petioles 0.3–1.1(1.8) cm long; leaflets in 8–44 pairs, 0.45–2.5(2.8) cm × 1.5–4.5(5.5) mm, oblong, apiculate, distinctly asymmetrical at the base, entire, glabrous except when very young; stipels slightly hooked, usually persistent; stipules 2–5(8) mm long, narrowly triangular to linear-lanceolate, caducous, sparsely hairy on the margins.
Raceme 13–14.3 cm long, 1–17-flowered; peduncle 2.1–4.3 cm long, sparsely pubescent near the base only, rarely totally glabrous, sometimes very slightly aculeate; pedicels 3–5(8) mm long, glabrous; bracts and bracteoles linear to linear-lanceolate, sparsely pubescent on the margins or glabrous, caducous, the bracts c.2.5 mm long, the bracteoles 1.5 mm long.
Pod pale green to straw-coloured, usually with a well-marked dark blotch above the septal area, (5.4)8–17.2 cm × 2–3.5 mm, held ± erect, linear to slightly falcate, torulose, shortly beaked, glabrous, (7)12–29(31)-seeded; septa 5–7 mm apart.
Seeds pale to dark brown, unmottled, 3.5–4 × 1.5–2 mm, 1–1.25 mm thick, ellipsoid; subcentral hilum in small circular pit.
Calyx 2.5–5 × 3–4.5 mm, the teeth 0.5–1 mm long, acute, somewhat woolly at the margins.
Ovary 17–29(31)-ovulate, glabrous; style glabrous (or very rarely with a few hairs).
Stems glabrous, often slightly aculeate (occasionally the prickles very evident).
A slender glabrous undershrub up to 8 ft. high
Annual herb 1–3 m tall.
Flowers small.
