Climbing perennial herb; stems moderately hairy, particularly in upper parts. Lvs sparsely to moderately hairy, especially on petioles; leaflets broadly ovate to deltoid, acute, entire, 30-100-(120) mm long; stipules ovate-triangular, c. 3-6 mm long; stipels narrower than stipules, 2-5 mm long. Infl. racemose, = or > lvs, (3)-6-20-flowered, with numerous bracteoles. Pedicels ± = fls. Calyx sparsely hairy; calyx teeth much < tube. Corolla usually scarlet, sometimes white, 15-30 mm long; beak of keel forming c. 11/2 turns of a spiral. Pod glabrous, brown, oblong and usually somewhat curved, 2-10-seeded, 10-30 cm long; seeds large, variable in shape and colour.