Undershrub, 60-150 cm tall, stem woody, pubescent when young. Leaf trifoliolate, petiole 2.0-7.5 cm long, the terminal leaflets 7.0-15 cm long, 3.0-7.0 cm broad (lateral leaflets smaller), ovate, elliptic or broadly lanceolate, acute or subobtuse, glabrous above, appressly pubescent below, petiolules c. 2.5 mm long, stipels 6-7 mm long; stipules c. 10 mm long. Inflorescence terminal and axillary raceme, 15.0-25.0 cm long. Bracts and bracteoles linear, acute. Pedicel 5-7.5 mm long. Calyx 2.5-3.0 mm long, hispid, teeth slightly exceeding the tube. Corolla 6-7 mm long, vexillum white, wings and keel blue. Fruit 2.5-4.5 cm long, 6-10-jointed, both sutures slightly undulate, each article c. 4.5 mm long, pubescent, hairs hooked, minute.