Evergreen shrub to small tree; twigs ribbed, densely hairy. Lvs 2-pinnate, alternate, moderately hairy on rachis, sparsely hairy on lower surface of pinnules; pinnae in 8-15 pairs; pinnules in 20-40-(45) pairs, fairly close set, oblong, acute, entire, asymmetric with one prominent vein closer to upper margin, 5-10 × 1-2.5 mm; petiole 3-8 cm long; stipules minute; usually a solitary gland present on petiole only, sometimes small glands present between 2 uppermost pairs of pinnules. Fls 5-merous, greenish yellow, shortly pedicellate, numerous, in axillary simple racemes much < lvs; bracts subtending raceme, and bracteoles subtending pedicels small, narrow-triangular, caducous. Pod glabrous, straight, 8-15 cm long, 12-18 mm wide; seed dark brown or black, smooth, ellipsoid, c. 7 mm long.