Annual herb, to 60 cm, glandular-hairy. Leaves: petiole to 4 cm, without a gland; leaves with 2 pairs of opposite leaflets with a gland on the rhachis between each pair. Inflorescences terminal. Petals 5-6 mm, yellow, orange, salmon or pinkish-red with reddish-brown veins. Stamens 5, subequal; filaments straight. Pod 3-6 cm, flat.