Tree 8-20 m high, 10-50 cm dbh. Young twigs pilose, the hairs up to 0.8 mm long, older ones more sparsely pilose to glabrescent or puberulous. Leaves imparipinnate with 2-3(-4) pairs of lateral leaflets; total length up to 19 cm including petiole of 2-2.5 cm; rachis segments 0.5-1.5 cm long, petiole and rachis segments semiterete, usually somewhat pubescent or pilose; leaflets chartaceous to subcoriaceous, glabrous and sometimes shiny above, sparsely pilose beneath; lateral leaflets elliptic, the largest 4.5-8.4 by 1.5-3.5 cm, base unequal, ± sessile, apex acuminate; apical leaflet elliptic or usually markedly rhomboidal, 6.7-12 by 2.2-5 cm, base shortly attenuate to form a winged petiolule up to 1 cm long, apex acuminate; margin markedly crenate, 13-17 notches on each side of the largest lateral leaflets; midrib slightly depressed above, prominent and pilose beneath, secondary and tertiary venation slightly raised on both surfaces. Stipules suborbicular, up to 1.7 by 2.2 cm. Inflorescence usually 4 dyads or tetrads, sometimes a few successive nodes flowering simultaneously; peduncles puberulous; axes of racemes up to 9 cm long, densely puberulous. Flowers unisexual and plants dioecious; pedicel 0.8-1.5 mm long, puberulous; calyx lobes 0.6-0.7 by 0.4-0.6 mm, hirsute on outer sur-face; corolla oblong or irregularly obovate, 1-1.2 by 0.6-0.8 mm, rounded or emarginate at apex; disc lobes c. 0.3 mm long, broadly oblong; in male flowers: filaments 2.2-3.4 mm long, ovary 0.4-0.6 mm long, pubescent, styles 0.1-0.4 mm long, incurved; in female flowers: filaments 0.7-1.2 mm long, ovary 1-1.2 mm long, densely pubescent, styles 0.9-1.1 mm long, straight, stigmas capitate, papillose. Capsule with valves 2-2.7 by 1.3-1.5 mm at dehiscence; exocarp densely pubescent to velutinous; calyx lobes caducous or not. Seeds c. 0.7 mm long, comose at both ends, the hairs to 1 mm long.
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