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Leaves (2)6–8(12) cm long, the rachis glabrous or almost so, with or occasionally without prickles; petioles 4–7 mm long; leaflets in (4)12–21(25) pairs, 4–7(9) × 1.75–3 mm, oblong to oblong-elliptic, rounded to slightly emarginate at the apex, apiculate, asymmetrical at the base, glabrous; stipules 2.5–3 mm long, narrowly triangular, acuminate, margins sometimes with a few sparse hairs, usually persistent.
Erect, annual herb, up to 1 m high, armed with prickles. Leaves pinnate with several leaflets along rachis; leaflets oblong, glabrous, 5(-9) x 2(-3) mm. Flowers: raceme 1-5-flowered; axis of inflorescence > 20 mm long; corolla with standard up to 15 mm long, yellow with continuously dark purple veins; Feb., Mar. Pods ± 80-100 x 2.5 mm, septa 4-5 mm apart, slightly torulose, not winged.
Raceme axillary, 1.1–5 cm long, 1–5-flowered, the rachis usually aculeate; peduncle 1.1–2.5 cm long; pedicels 3–8 mm long, glabrous; bracts 1.5–2 mm long, linear-lanceolate, somewhat persistent; bracteoles 1–1.5 mm long, linear, located at base of the hypanthium, at length falling.
Pod 8–10 cm × 2–2.5 mm, linear to very slightly falcate, torulose when young, hardly so when mature, rostrate, slightly stipitate, erect, glabrous, 10–19(20)-seeded; septa 5 mm apart; valves with reticulate venation in central area above seeds.
Seeds brownish-green, with or without blackish-purple spotting, 3 × 1.5 mm, 1.3 mm thick; small hilum in central circular pit.
Stems with or occasionally without prickles, glabrous or sometimes the prickles with a terminal hair.
Calyx 3–4.2 × 3 mm; tube glabrous; teeth 0.6–1 mm long, acuminate, sparsely woolly on the margins.
Ovary and style glabrous, 16–19(20)-ovulate.
Erect annual herb 0.3–1 m tall.
