Woody deciduous climber up to 30 m long; twigs densely hairy when young, becoming ± glabrous. Lvs densely hairy when young, becoming ± glabrous above when mature but usually remaining moderately clothed in appressed hairs below, petiolate; leaflets elliptic to obovate, acuminate, entire, in (3)-4-6 opposite pairs, 30-80 mm long, stipellate; petiolules 2-4 mm long; stipules inconspicuous. Raceme with numerous fls; pedicels c. 15-20 mm long. Calyx densely clothed in fine hairs; calyx teeth ovate-triangular, < tube. Corolla mauve to deep lilac, (15)-20-25-(28) mm long. Pod tomentulose, few-seeded, (6)-10-15 cm long; seeds smooth, brown, flattened, suborbicular.