Small annual 5–10 cm tall, with numerous decumbent to shortly ascending branches from the base; stem slender, densely appressed pubescent. Leaves mostly 3-foliolate, the uppermost often 1-foliolate; leaflets 5–16 × 3–8 mm, oblanceolate-elliptic to obovate, subacute to rounded at the apex, thinly pilose above, more densely so beneath; petiole 2–8 mm long; stipules 0. Flowers 6–20 in sessile to pedunculate heads or racemes, sometimes with a few flowers in the axils below; bracts 1–3 mm long, linear; pedicel 1.5–2.5 mm long, without obvious bracteoles. Calyx 2.5–3 mm long, densely appressed pubescent; upper lobes triangular, 1–2 times as long as the tube. Standard obovate, bright yellow, with red marks at the base inside, reddish lined and tomentellous outside; wings a little shorter than the keel; keel 3.5–4.5 mm long, angular, with a narrow twisted beak. Pod sessile, 4–5 × 3–3.5 mm, ovoid-globose, pubescent, 12–16-seeded. Seeds 1 mm long, rounded-cordiform, smooth.