Tree 6–36 m. high; crown spreading, flat; bark rough, flaking off. Young branchlets puberulous or shortly pubescent, later glabrescent. Leaves: rhachis ± thinly crisped-puberulous or shortly pubescent; pinnae (2–)3–6(–8, fide I.T.U.) pairs; leaflets (4–)6–11(–12) pairs, oblong to elliptic- or ovate-oblong, 13–33 mm. long, 5–14(–17) mm. wide, rounded at apex, subglabrous except for a few hairs on midrib beneath, or sometimes ± thinly puberulous beneath especially towards base. Flowers subsessile or on pedicels 0.5–2 mm. long; bracteoles already fallen by flowering time, minute, mostly 1.5–2 mm. long. Calyx 3.5–6.5 mm. long, not slit unilaterally, puberulous outside, with a few shortly stipitate glands (× 20 lens necessary) principally on outside of lobes. Corolla 8–13.5 mm. long, white or whitish, puberulous outside. Staminal tube not or scarcely exserted beyond corolla; filaments 1.7–4 cm. long, red above, white below. Pod oblong, (10–)14–21 cm. long, (2.3–)3.2–3.7(–4.8) cm. wide, glabrous or nearly so, ± glossy, obscurely venose, brown or purplish-brown, usually ± tapered and acute at base and sometimes apex. Seeds about 9–12 mm. long and 8–9 mm. wide, flattened.
