Small tree, up to 15(-30) m by up to 62 cm diam., small buttresses sometimes present Branchlets 5-8 mm thick, young parts rather densely pilose to glabrous, as are the leaves (leaflets excepted), inflorescences and infructescences; pith sometimes with a closed cylinder of many small vascular strands. Leaves 2-5(-7)-jugate, the lowest pair of leaflets tending towards pseudostipules, often rather early caducous except their petiolules. Petioles 1-14 cm long, at base much swollen and flattened to deeply furrowed, pith with some vascular strands. Leaflets (ovate to) oblong-lanceolate or oblanceo-late, 5-20(-32.5) by 2-6(-11) cm, rigidly chartaceous to pergamaceous, sometimes slightly bullate, glabrous or slightly pilose on the midrib beneath; base cuneate to rounded; apex (sub)-abruptly acuminate, acumen 1.5-2.5 cm, slender; nervation much prominent below, nerves (8-) 10-24 pairs, straight or curved, more or less distinctly arching. Panicles terminal, branched from the base, usually pilose, ♂ 35-80 cm long, main branches up to 40 cm, female 10-85(-140) cm, main branches up to 30 cm long. Flowers long-stalked, male 4 mm long, female 6 mm. Calyx slightly pilose, 1-1.5 mm high. Petals glabrous. Filaments adnate to the disk. Disk in male flowers annular, in female ones cupular, always thick. Pistil in ♂ flowers slightly reduced. Fruits oblong-ovoid, not or slightly oblique, usually slightly contracted at the apex, 2½-4½ by ¾-2 cm. Cotyledons contortuplicate, palmatifid.
In primary forests at low and medium altitudes, in N. Sumatra and on Mt Kinabalu ascending to 900-2000 m, in Brunei once collected in swampy habitat. Fl. Febr.-April, Aug.-Oct., fr. May-Jan.
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