A woody climber, branches sparsely pubescent. Leaf trifoliolate, petiole 7.5-15 cm long, twisted at the base, leaflet c. 15 cm long, c. 10 cm broad, elliptic, acuminate, sparsely pubescent on both sides; lateral leaflets oblique, broader than the terminal; stipels 3.5-4.0 mm long; stipules c. 7.5 mm long. Inflorescence a raceme, usually axillary pendulous, peduncle up to 30 cm long; flowers clustered in threes; each cluster supported by a deciduous bract. Pedicel c. 1.2 cm long. Calyx 1.7-2.5 cm long, velvety, teeth almost as long as the tube. Corolla dull purple. Vexillum 3.7-3.8 cm long. Keel 5-6.3 cm long, incurved. Fruit 10-15 cm long, c. 5.0 cm broad, obliquely plaited. 3-4-seeded. c. 1.2 cm broad wings at each suture on either side.

Fl.Per.: July-October

Type: ‘Habit inter sepes in Cochinchina’, Loureiro (BM).

Distribution: Kashmir; India; Sikkim; Burma: Andamans; Philippines.