Tree up to 30 m high, dbh up to 50 cm, buttressed; probably dioecious. Hairs mainly in small stellate tufts. Twigs 2-4 mm in diam., canaliculate, dark purple-brown, sparsely fulvous short sericeous, early glabrescent, with many small white lenticels. Leaves spirally arranged to (sub)decus-sate, 1-foliolate or 1-or 2-jugate; petiole 2.5-10 cm long, 3-angular to terete; petiolules 0.3-1.5 cm long, above with a shallow broad groove. Leaflets (sub)opposite, 6-26 by 3-13.5 cm, index 1.5-3, chartaceous, glabrous except for occasional hair tufts in some of the nerve axils beneath; base symmetrical to slightly oblique, cuneate to rounded, attenuate; apex (obtuse or) gradually to abruptly, broadly, and obtusely acuminate; midrib above prominulous, towards the base sometimes sunken; nerves 1.25-6 cm apart, usually strongly curved, about equally prominulous at both sides; intersecondary nerves faintly to sometimes strongly developed. Inflorescences thyrsoid to paniculate, up to 25 cm long, puberulous to tomentellous; cymules sometimes scattered, either few-flowered or flowers solitary; pedicels up to 5 mm long; bracts and bracteoles 3-angular, up to 1 mm long. Sepals 4 or 5, valvate, 2-2.5 by 1.5-2.5 mm, inside tomentose with glabrous longitudinal strips. Disc glabrous to velutinous. Stamens 6 or 7; filaments c. 5 mm long; anthers ovate, c. 1 mm long, dehiscence latero-in-trorse. Ovary slightly 2-lobed; style short; stigma 2-lobed with short, thick lobes curved outwards, to knobby. Infructescences hardly different from the inflorescences. Fruits few, 2-lobed, c. 1.25 by 2 by 1 cm, often 1 lobe suppressed, then transversely ovoid and c. 1.25 by 1.5 by 1.25 cm, smooth and glabrous, pericarp thin, fleshy. Seeds: testa closely adnate to the endocarp, hardly separable, thin-coriaceous.
Primary forest on alluvial plains, slopes, or ridges, also on river banks, at elevations up to 200 metres.
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