Perennial shrub, up to 3 m tall. Stem glabrous, soft, pith white spongy. Leaf sessile or subsessile, leaflets 61-101, alternate or opposite, 3-13 mm long, 1.5-3 mm broad, linear, oblong, obtuse, apiculate, glabrous. Stipules 1.2-1.3 cm long, lanceolate, base auriculate; deciduous. Inflorescence a 2-7-flowered, axillary raceme. Peduncle and pedicel hairy. Bracts 3-3.5 mm long. Calyx 9-10 mm long, hispid, bilabiate, upper lip rounded, the lower 3 lobed. Corolla 18-19 mm. Vexillum glabrous, keel pubescent externally. Fruit 5-7.5 cm long, 6-10 mm broad, 4-8 jointed, often indented on both sutures, echinulate on both surfaces.