Stem erect, hollow, c. 30-60 cm or more tall, glabrous. Leaf imparipinnately compound, c. 15-23 cm long, leaflets 17-19, c. 1.2-4.0 cm long, obtuse, sparsely white-pubescent below, becoming glabrescent; stipules c. 6-13 mm long, lanceolate or deltoid, free. Inflorescence apeduncled raceme. Bracts linear. Calyx c. 9-10 mm long, pubescent, teeth c. 4.5-5 mm long. Vexillum c. 17-19 mm long, glabrous. Keel shorter than the wing and the vexillum. Fruit c. 2.5-2.6 cm long, pubescent, bilocular, 8-10-seeded, stipe c. 9-10 mm long.