Tree, 4-35 m by up to 7 diam., with up to 1½ m high buttresses. Branchlets 0.5-1.5 cm thick, pubescent or glabrous; terminal bud 2-3 cm long. Leaves 2-7-jugate. Petioles (4½-)7½-29 cm, strongly channelled at the base. Leaflets lanceolate to oblong, 6½-26 by 3-10 cm, upper surface glabrous, under surface densely pubescent when young, glabrescent; base rounded (or one half cuneate); apex tapering or short-acuminate; midrib and nerves strongly prominent underneath, on upper surface nerves and veins rather distinct; nerves (9-)11-19 pairs (angle 60-80°), curved near the margin, specially at base and apex arching. Panicles axillary, 3.5-13 cm, contracted, pubescent to glabrous; peduncle 0-2 cm. Flowers 2-4 mm long, pubescent. Calyx 0.5-0.75 mm high. Filaments more or less adnate to the disk. Disk cupular. Pistil in ♂ flowers strongly reduced. Infructescences 4.5-30 cm, pubescent. Fruits 1-1¾ by ¾-1½ cm, stigma strongly lateral to near the pedicel.
Forests, usually under 100 m alt. (once 240-300 m, once 1150 m), Borneo 1500-1800 m. Fl. Jan.-Febr., and Aug.-Sept., fr. Febr.-March, June, Dec.
Home