Tree 5-20 m high, up to 40 cm dbh. Twigs with sparse indumentum. Leaves imparipinnate with (0-)2-6 pairs of lateral leaflets; total length up to 22 cm including petiole of 1.5-3.5 cm; rachis segments 1.2-2.5 cm long; petiole and rachis segments terete to semiterete, densely pubescent on upper side; leaflets chartaceous to subcoriaceous, glabrous above and beneath; lateral leaflets lanceolate, narrowly ovate or narrowly elliptic, the largest 4.5-10 by 1-3 cm, base unequal, ± sessile or shortly petiolulate, apex acuminate; apical leaflet narrowly elliptic, 5.5-9.5 by 1.5-2 cm, base attenuate into a petiolule c. 0.7 cm long, apex acuminate; margin almost entire to crenulate, 10-15 notches on each side of the largest lateral leaflets; midrib slightly depressed above, puberulent at base, prominent beneath and sparsely strigose; secondary and tertiary venation slightly raised on both surfaces. Stipules ± orbicular and larger ones amplexicaul, up to 1.4 by 1.6 cm. Inflorescence of 1-3 pairs of dyads or tetrads, sometimes a few successive nodes flowering; peduncles 0.2-1.3 cm long, puberulous; axes of racemes up to 11.5 cm long, densely puberulous. Flowers unisexual and plants dioecious; pedicel 0.2-0.5 mm long, minutely strigose or puberulous; calyx lobes 0.5-0.7 by 0.4-0.5 mm, minutely strigose on outer surface; corolla obovate, 1.1-1.5 by 0.7-1.1 mm, apex rounded or irregularly emarginate; disc lobes 0.2-0.3 mm long, oblong; in male flowers: filaments 3.3-3.7 mm long, ovary 0.4-0.5 mm long, pubescent, styles 0.1-0.2 mm long, incurved; in female flowers: filaments 0.6-0.9 mm long, ovary 0.9-1.1 mm long, densely pubescent, styles 0.9-1.1 mm long, straight, stigmas papillose. Capsule with valves 1.9-2.5 by 1.2-1.5 mm at dehiscence; exocarp pubescent; calyx lobes persistent. Seeds ellipsoid to broadly ellipsoid, 0.5-0.7 mm long, 4 per capsule, comose at both ends, the hairs to 2 mm long.
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