Tree 10-40 m. Twigs 2-4 mm diameter, usually 2-edged, early glabrescent, hairs less than 0.1 mm, seemingly glabrous; older twigs ± fissured and transversely cracking; lenticels small. Leaves membranous or chartaceous, ovate-elliptic or elliptic-oblong, 12-27(-30) by 4-12 cm, base attenuate or rounded, apex acute-acuminate; upper surface olivaceous or (dark) brown, lower surface greyish, early glabrescent, hairs inconspicuous, scattered, scale-like, 0.1 mm or less; not papillose; dots absent; midrib ± flat or raised above, lateral nerves 15-21 per side, at 45-60(-70)° to the midrib, flat or sunken above, lines of interarching distinct or not, venation ± trabeculate, usually distinct below; petiole 15-25 by 2-3 mm; leaf bud 10-15 by (l-)2 mm, hairs 0.1-0.3 mm. Inflorescences between the leaves or below, glabrescent, indumentum brown, short; of the Knema-type: a simple or bifurcate, scar-covered brachyblast, sessile or l(-2) mm pedunculate; in male: to 10 mm long, 4-5 mm wide, with flowers in clusters of 5-10 (-15), buds unequal in size; in female shorter, simple or 2-forked, few-flowered; flowers with widely spaced hairs 0.1 mm. Male flowers: pedicel slender, (5-)6-8 by 0.6-0.7 mm, bracteole 1.5 mm, subpersistent or caducous, (sub)apical; buds ellipsoid-oblong, 4-5 by 1.5-2 mm, apex subacute or obtuse, cleft 1/4-1/3, lobes (1—)1.5 mm long, 0.1-0.2 mm thick. Androecium slender, 3-3.5 mm long; androphore 1.5 by 0.5 mm, with hairs 0.1 mm or less in the lower half; synandrium (1.5—)2 by 0.6(-0.7) mm, thecae 12-18, usually contiguous, sterile apex ± blunt, 0.2(-0.3) mm long. Female flowers: pedicel 3-5 mm, bracteole scar subapical; buds ovoid, 4.5 mm; ovary ovoid-oblong, hairs 0.2 mm. Fruits 1 or 2 (or 3) per infructescence, subsessile, subglobose, short pear-shaped, ellipsoid, or ± depressed-globose, 3-4 by (2.5-)3-4 cm, apex broadly rounded, base rounded or narrowed, ± glabrescent, hairs mealy, greyish brown, 0.1-0.2 mm; pericarp 3-5(-8) mm thick; seeds broadly ovoid-ellipsoid or subglobose, 1.5-2(-2.5) cm, with conspicuous impressions left by the aril; fruiting pedicel rather stout or slender, 7-10 by 3-5 mm, bracteole scar subapical.
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