Erect laxly branched annual, mostly 1–2 m tall, with sparsely appressed puberulous and glabrescent branches. Leaves 3-foliolate; leaflets mostly 3–6 × 0.8–2.8 cm, lanceolate to elliptic, glabrous above, sparsely puberulous or subglabrous beneath; petiole usually a little shorter than leaflets; stipules 1–4 mm long, linear, caducous. Racemes lax, short and few-flowered at first, but elongating and ultimately 10–35 cm long and many-flowered; bracts 1.5–2.5 mm long, linear; bracteoles small. Calyx 6–8 mm long, sparsely puberulous; lobes attenuate-triangular, longer than tube. Standard elliptic-obovate to subcircular, pale yellow, fading orange, glabrous outside; wings 0.7–0.8 times as long as keel; keel 1.1–1.4 cm long, rounded a little below the middle, with a slightly incurved acute beak. Pod (2.5)2.8–3.6 cm long, ellipsoid-clavate, abruptly contracted to the 9–13 mm long stipe, puberulous, glabrescent. Seeds mostly 4.5–6 mm across, subcircular, thin, markedly rugose towards the margin, brown with darker speckling.