Prostrate annual, often tufted; stems moderately to densely hairy. Lvs moderately hairy; tendrils simple or 0; leaflets in 1-3 pairs, ± opposite, elliptic-oblong to obovate, (3)-5-10-(15) mm long; stipules with 1, adaxial, basal lobe or dentate. Infl. much < lvs, 1-flowered. Peduncle much < fls. Pedicel 0.5-2 mm long. Calyx slightly gibbous at base; calyx teeth ± equal, ± = or < tube. Corolla purple, 5-8 mm long; limb of standard ± = claw. Pod glabrous, dark greyish brown, c. 7-10-seeded (rarely fewer), 15-25 mm long; seeds cubic, tuberculate, reddish brown; hilum c. 1/12 of circumference.