Tree (7-) 10-30 m. Twigs 1.5-2.5(-4) mm diameter, glabrescent, hairs 0.1 mm; older twigs dark grey-brown to blackish, coarsely striate, not or but rarely flaking; lenticels absent. Leaves chartaceous or thinly coriaceous, elliptic-oblong to oblong-lanceolate, 8-22 by 2-8 cm, base broadly acute or attenuate, apex acute(-acuminate); upper surface olivaceous, ± glossy, lower surface grey-or silvery-brown, sometimes late glabrescent, hairs dense, inconspicuous, 0.1 mm, with scattered brown hairs to 0.2 mm; not obviously papillose; dots absent; midrib above flat or somewhat raised, in a groove, lateral nerves 10-17 per side, at 45-60° to the midrib, ± sunken, indistinct above, lines of inter-arching and venation indistinct; petiole 12-22 by 1.5-3 mm; leaf bud 10-15 by 2-3 mm, hairs 0.1 mm. Inflorescences among the leaves, pedunculate, with mealy hairs, 0.1-0.2 mm; bracts ovate, 2-3 mm, caducous; in male: 1-2.5 cm long, peduncle 5-15 mm; lateral branches up to 5 mm, central axis to 10 mm or absent (or reduced to one flower), with subumbels of 5-8(-10) flowers, buds of various sizes; female inflorescence: an up to 3 mm pedunculate wart (rarely ± forked), with 2-4-flowered subumbel; flowers with hairs 0.1 (-0.3) mm. Male flowers: pedicel 3-6 by 0.5 mm, bracteole l(-2) mm, (sub)-apical, (late) caducous; buds ellipsoid-oblong, ± cylindrical or ± contracted in the middle, 5-7 by 2-3 mm, apex ± angled, cleft 1/3-1/2, lobes 2-3 mm long, 0.5(-l) mm thick, at anthesis ± curved outwards. Androecium 3.5-4.5 mm; androphore 1.5-2(-2.5) by (0.6-)0.8-l mm, hairs pale, 0.1 mm or less; synandrium ellipsoid-oblong, 1.8-2 by 0.6-0.8 mm, thecae 12-16, sterile apex blunt, 0.2-0.3 mm, minutely pubescent (Peninsular Malaysia, Borneo) or± acute, (sub)glabrous (Sumatra). Female flowers: pedicel 2.5-4 mm; buds ovoid-ellipsoid, angled at apex, 5-6 by 2.5-3 mm, cleft 1/3-1/2; ovary ovoid-conical, 2.5 by 1.5-2 mm, with dense hairs 0.1 mm or less. Infructescence 0.5-2 cm. Fruits solitary or 2 (or 3), broadly ellipsoid or oblong, or ± pear-shaped, 5-9 by 2.5-5 cm, base rounded or subattenuate, hairs dense, mealy, rusty, 0.1(-0.2) mm; pericarp (5—)8—15 mm thick; seeds ellipsoid, 3.5-5.5 cm; fruiting pedicel rather stout, 5-10 mm.
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A tree. It grows 20-25 m tall. The stem is 25 cm across. The bark is dark brown to grey. The twigs are slender and have fine scales over them. The leaves are thin and leathery. The leaf stalk is 1.5 cm long. The leaf blade is oblong to sword shaped and 15-20 cm long by 6-7 cm wide. They are silvery brown underneath. It has male and female flowers on separate trees. The flowering sections are short and about 1 cm long. The flowers are 6 mm long. The fruit is oval and 7-9 cm long by 5 cm wide. They are rusty brown with a scale like pattern. The outer layer is thick. The seed has a thin red covering or aril.
Forests, mainly in lowland and on low hills, occasionally ascending to 1,000 metres. Primary lowland and hill mixed dipterocarp, peat swamp, kerangas and lower montane forests, on a variety of soils; at elevations up to 1,400 metres.
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It is a tropical plant. It grows in the lowlands and low hills. It can grow up to 1000 m altitude.
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