Tree 2.5–15 m. high; bark grey, rough. Young branchlets puberulous, sometimes pubescent. Leaves: rhachis subglabrous, puberulous or sometimes pubescent; pinnae (1–)2–4(–5) pairs; leaflets 3–11 pairs, 15–48 (–65) mm. long, (6–)8–24(–33) mm. wide, oblong or elliptic-oblong (terminal leaflets ± obovate), somewhat asymmetric with midrib nearer upper margin, rounded at apex, glabrous or rarely thinly pubescent above, beneath subglabrous or puberulous, rarely pubescent. Flowers pedicellate; pedicels 1.5–4.5(–7.5) mm. long, puberulous; bracteoles minute, about 2–3 mm. long, falling in early bud. Calyx (2.5–)3.5–5 mm. long, not slit unilaterally, ± puberulous outside. Corolla 5.5–9 mm. long, glabrous outside except for puberulence on outside of lobes. Staminal tube not or scarcely exserted beyond corolla; filaments 1.5–3 cm. long, pale green or greenish-yellow in upper part, white below. Pod oblong, (12–)15–33 cm. long, (2.4–)2.9–5.5 (–6) cm. wide, glabrous, or almost so except near base, coriaceous, glossy, ± venose, pale straw-coloured, not (or rarely to 5 mm.) stipitate at base. Seeds 7–11.5 mm. long and 7–9 mm. wide, flattened, marked by bumps on the outside of the valves, the alternate ones more projecting on each valve.
