Erect laxly branched annual, mostly 40–120 cm tall, with pubescent branches. Leaves 3-foliolate; leaflets 3.6–6.2 × 1.8–3.6(4) cm, elliptic, glabrous above, pubescent beneath; petiole a little shorter to a little longer than the leaflets; stipules 3–7 mm long, linear. Racemes short and few-flowered at first, elongating and ultimately c. 20 cm long and many-flowered; bracts 4–5 mm long, linear-lanceolate; bracteoles up to 2 mm long, filiform. Calyx 1–1.4 cm long, sparsely to conspicuously puberulous; lobes narrowly attenuate-triangular, 2–3 times as long as the tube. Standard elliptic-oblong, yellow, subglabrous outside; wings 0.75–0.9 times as long as keel; keel (1.2)1.4–1.6 cm long, rounded about the middle with a projecting obtusely pointed beak. Pod up to 2.4 cm long, broadly ellipsoid-clavate, abruptly contracted to the 4–5 mm long stipe, pubescent. Seeds c. 5 mm in diameter, subcircular, flattened, rugose, brown.