Scrambling annual; stem ± glabrous. Lvs sparsely to moderately hairy; tendrils branched at least in upper lvs; leaflets in 5-10 pairs, often alternate, linear to narrowly elliptic-oblong, 5-17 mm long; stipules entire or with 1, adaxial, basal lobe. Infl. = or < lvs, 2-6-flowered. Peduncle much > fls. Pedicel 0.5-2 mm long. Calyx slender at base; calyx teeth unequal; lower teeth slightly > tube; upper teeth much < tube. Corolla mauve, 5-6 mm long; limb of standard ± = claw. Pod ± glabrous, brown, usually 2-seeded, 15-22 mm long; seeds smooth or tuberculate, dark brown with reddish brown blotches or dark reddish brown; hilum 1/10-1/7 of circumference.
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