Shrub or tree 2-20 m high, up to 35 cm dbh. Twigs ± glabrous or adpressed puberulent. Leaves imparipinnate with (0-)1-4(-5) pairs of lateral leaflets; total length up to 16 cm including petiole of 0.7-2.8 cm; rachis segments 0.5-1.9 cm long; petiole and rachis sometimes narrowly winged, wings extending up to 1 mm from midline; leaflets coriaceous, with upper cuticle appearing quite thick, glabrous except for some hairs on midrib beneath, sometimes shiny above, characteristically drying grey or dark chestnut above and chestnut beneath; lateral leaflets narrowly elliptic or narrowly obovate, the largest 2.4-7 by 0.6-1.9 cm, base unequal, ± sessile, cuneate, apex acute to obtuse; apical leaflets narrowly elliptic to obovate, scarcely larger than largest laterals, 3-9.4 by 0.7-2.7 cm including the narrowly cuneate to attenuate base 0.3-1.2 cm long, apex acute to obtuse; margin crenate, 6-11 notches on each side of the largest lateral leaflets; midrib slightly depressed above and prominent beneath; secondary and tertiary venation flat on both sides. Stipules suborbicular, usually flat, up to 1.7 by 1.9 cm (rarely spathulate, c. 0.6 by 0.4 cm). Inflorescence usually 1 or 2 pairs of opposite dyads; peduncles 0.3-1.9 cm long, racemes usually not longer than the leaves (7-8 cm), rarely up to 14 cm long; peduncles glabrous or adpressed puberulent, axes of racemes puberulent, rarely tomentose. Flowers unisexual and plants dioecious; pedicel 1.8-3.6 mm long, puberulous; calyx lobes 0.5-0.8 by 0.4-0.9 mm, glabrous; corolla often rotate, petals oblong or irregularly obovate, 1.2-1.5 by 0.7-0.8 mm, rounded or emarginate at apex; disc lobes 0.3-0.5 mm long, oblong and discrete or with thin flanges on either side so they form an almost continuous disc; in male flowers: filaments 2.1-2.6 mm long, ovary 0.5-0.7 mm long, pubescent, styles 0.1-0.2 mm long, incurved; in female flowers: filaments up to 1.7 mm long, ovary c. 1 mm long, densely pubescent, styles c. 1.8 mm long, straight, stigmas capitate, papillose. Capsule with valves 2.5-3.5 by 1.3-1.5 mm at dehiscence; exocarp pubescent; calyx lobes persistent. Seeds c. 0.9 mm long, comose at both ends.
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