Tree 4-17 m. Twigs 1-3 mm diameter, rather late glabrescent, hairs pale rusty, stellatedendroid, (0.2-)0.5 mm long; rather bark finely striate, not cracking; lenticels small, inconspicuous. Leaves membranous, oblong(-lanceolate), 10-18(-27) by 3-6.5 cm, base (rounded to short-)attenuate, apex acute-acuminate; upper surface drying dull olivaceous, glabrous, lower surface light brown, glabrous except midrib and the very base; dots absent; midrib raised above, on lower surface late glabrescent; nerves 10—15(—18) pairs, raised, lines of interarching fairly regular, distinct or not; venation lax, ± indistinct; petiole 10-15 by 1.5-2 mm, late glabrescent; leaf bud 6-8 by 1.5 mm, with dense hairs (0.2-)0.5 mm. Inflorescences with sparse woolly hairs (0.2-)0.5 mm; in male: many-flowered, 2 or 3(-4) times branched, 4-10 by 3-5(-7) cm, peduncle 0.3-1.2 cm long; in female: similar to male, or shorter; bracts oblong to lanceolate, 2-5 mm, pubescent, caducous; flowers in male in clusters of 5-8, in female fewer, glabrous or sometimes a few hairs less than 0.1 mm towards the base of the pedicel; perianth 3-lobed, pedicel articulated. Male flowers: pedicel 0.8-1.3 mm long; buds globose to depressed globose, 0.7-1.2 by 1-1.2 mm, cleft c. 1/2, lobes 0.2-0.3 mm thick; androecium subglobose (including androphore) 0.4-0.5 by 0.5-0.7 mm, ± triangular in cross section (Plate 3: 69); thecae 10-14, suberect, 0.3-0.4 mm long, free for at least the upper half, column largely hollow, passing into the broad tapering androphore 0.2-0.3 mm long. Female flowers: pedicel 1.5 mm; buds subglobose, 1.5 mm diameter, cleft c. 1/2; ovary globose, glabrous, 1-1.2 mm diameter, stigma minutely 2-lipped, 0.1-0.2 mm long. Fruits (in Sumatra) 2 or 3 together in a short infructescence 2-3 cm long, glabrous, ellipsoid, 2.2-2.4 by 1.5-1.6 cm, apex rounded, base contracted into a 2-4 mm long narrowed part; pericarp 2 mm thick, not or sparingly tubercled; fruiting pedicel 5 mm long; perianth not persistent.
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