Scrambling perennial; stems ± glabrous or sparsely clothed in appressed hairs. Lvs usually moderately clothed in appressed hairs above and below; tendrils branched at least in upper lvs; leaflets in 5-12 pairs, sometimes alternate, ovate-oblong or narrowly elliptic, (5)-12-20 mm long; stipules entire or with 1-(2), narrow, adaxial, basal lobes. Infl. > lvs, (6)-10-40-flowered. Peduncle much > fls. Pedicel c. 2 mm long. Calyx strongly gibbous at base, ± glabrous or sparsely hairy; calyx teeth very unequal; lower < tube. Corolla violet, purple or bluish lilac, (13)-14-18 mm long; limb of standard 1/2 as long as claw. Pod glabrous, brown, 3-8-seeded, 20-35 mm long; seeds dark greenish brown or mottled, 3-4 mm diam.; hilum 1/9-⅙ of circumference.