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Standard yellow, speckled with purplish-black on the outer face, 1.4–1.65 × 1.1–1.4 cm, broad, rounded, apically emarginate, the appendages 1–1.5 mm long abruptly rounded and sometimes emarginate at the top; wings 1.4–1.75 cm × 3–5.5 mm, usually with a small, slightly hooked upper basal tooth and with lamellate sculpturing in the upper basal half on outer face; keel 1.3–1.6 cm × 6–7.5 mm, with basal tooth acute, the apex 2 mm long, forming an angle of 40°–70° with the claw.
Leaves 1.2–10 cm long (37.5 cm long on lower parts of plant), the rachis sometimes with a few prickles; petioles 0.15–0.9 cm long (6.5 cm on larger leaves); leaflets in (1)3–32 subopposite pairs, 0.5–1.4(4) cm × 2–5(6.5) mm, oblong to narrowly obovate, rounded to emarginate at the apex, apiculate, entire, glabrous although slightly pubescent when young; stipules 2–7 mm long, lanceolate, long acuminate, erect or spreading, sparsely pilose, usually caducous.
Raceme (1)2–12 cm long, (1)2–13-flowered; peduncle 0.8–2.8(4) cm long, glabrous or sparsely pilose especially near the base, sometimes with small prickles intermixed with the hairs; pedicels (0.2)0.6–1 cm long, glabrous or with an occasional hair, sometimes with very small prickles; bracts and bracteoles linear-lanceolate, sparsely pilose on the margins, caducous, the bracts 3–4 mm long, the bracteoles 2–3 mm long.
Pod straw-coloured, mottled dull reddish-brown when mature, (4)7.5–29.5 cm × 2.5–4.5 mm, slightly falcate, torulose, stipitate, shortly beaked, glabrous, (2)5–40-seeded; septa 6–8 mm apart.
Seeds pale brown to olive-greenish-brown to almost black, not mottled, 4–4.5 × 2–2.5 mm, 1–2 mm thick, elliptical; hilum in a small, subcentral circular pit.
Calyx 4–7 × 4–7 mm, the tube glabrous; teeth 0.7–1.3 mm long, slightly acuminate, shortly woolly on the margins.
Ovary glabrous, often slightly thickened towards the base of the style, the style pubescent except at the base.
Stems glabrous or sparsely pilose when young, rarely with a few obscure prickles.
Erect slightly woody annual herb, 1–5.5 m tall.
