An erect tree, 6-10 m tall, bark ash-coloured. Leaves 6-20 cm long, bipinnate¬ly compound, pinnae 4-8 pairs, 4-6 cm long, leaflets l0-20 pairs, sessile or subsessile, linear-oblong, obtuse, sometimes slightly mucronate, narrowed towards the base, 7-15 mm long, c. 2-3 mm wide. Inflorescence terminal raceme, the lower flower with the longest pedicel, pedicel hairy, up to 2.5 (-3) cm long. Calyx 2-3 cm long, fused at the base, leathery, silky pubescent, oblong, narrow and sharp pointed. Corolla white in the beginning, turning yellow, the upper petal is smaller and darker in colour; sub-orbicular, curled at the margins, c. 2.5 cm long. Stamens hairy, dark coloured, 5-10 cm long, thickened at the base. Pods 12.5-20 cm long, c. 6-25 mm broad, smooth, narrow at both the ends. Seeds 4-8.