Tree, 6-15 m, 10-40 cm ø; bark finely fissured or scaly, thin, greyish brown; inner bark fibrous, brownish, c. 2½ cm thick. Branchlets initially densely set with stiff simple hairs or adpressed stellate hairs, glabrescent, later lenticellate; terminal buds ovoid-globose, 3-4 by 2-3 mm, scales narrowly ovate, densely simple sericeous. Stipules linear-acute, 7 by 1-2 mm. Leaves thin-coriaceous, elliptic-lanceolate, rarely ovate, 5-16 by 1-5 cm, base acute or roundish, margin entire or remotely serrulate near the sharply acute or ½-1½ cm acuminate apex; beneath with a sparse stellate tomentum, above glossy, glabrous; midrib and nerves prominent beneath, impressed above; nerves 6-12 pairs, at an angle of 45-60°, parallel, arcuating towards the margin; reticulation obscure; petiole slender, 1-2½ cm, adaxially furrowed. Male rachis 2-5 cm; bracts ovate-acute, tomentose outside, 1-2 by 1 mm; ♂ flowers 1-3; perianth tomentose, filaments slender, 1-2 mm, anthers c. 1 by 1 mm. Female rachis ½-1½ cm, carrying 2-5 flowers; bracts ovate-acute, 0.5-0.7 by 0.3-0.5 mm; ♀ flowers: ovary ovoid-cylindrical, c. ½ mm long, rounded-triangular, staminodes 0, styles c.1 mm, tomentose at base. Young cupule ovoid-globose or obconical, lamellae 4-5, the 2-3 lower ones denticulate, the others entire. Ripe cupule cup-shaped, obconical, covering ¼-½ part of the fruit, 0.5-1.2 cm high, 0.7-1 cm ø, base rounded or attenuate, lamellae densely tomentose. Fruit ovoid-conical or ovoid-globose, 1-2½ by 1-1½ cm, densely sericeous, base obtuse or convex, apex acute or abruptly depressed-umbonate.
Forests, mostly at low altitude, in Java found at 850 m, on Mt Kinabalu at 1500 m; on sandy clay, sandy loam or granitic soil. Fertility seems irregular.
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