Tree 8-27 m tall. Twigs (2-)3-5 mm diameter, early glabrescent, hairs appressed, glossy, 0.1 mm or less; older twigs blackish, cracking, indistinctly lenticellate. Leaves (thickly) membranous, (elliptic-)oblong, (12—)15—35 by 3-10 cm, base attenuate or narrowly rounded, apex acute(-acuminate); upper surface brown, lower surface (brownish) grey, early glabrescent, hairs 0.1 mm or less; not papillose; dots absent; midrib (flat or) raised above, lateral nerves (10—)13—17 per side, at 45-70° to the midrib, ± flat, inconspicuous above, more or less raised below, often with intersecondary nerves, lines of interarching and venation indistinct on both surfaces; petiole 15-20 by 2-4 mm; leaf bud 10-15 by 2-3 mm, hairs 0.5-0.8 mm long. Inflorescences between the leaves or (as in the type) below the leaves, arranged in 1-1.5 cm long brachyblasts ending in a small sterile leaf bud, pedunculate, glabrescent, indumentum minute; bracts caducous; in male: peduncle of partial inflorescence 10-30 by 2-3 mm, with a subumbel of 4-7 flowers, buds of almost equal sizes; in female: peduncle 5—10(—15) mm, one-or few-flowered; flowers coriaceous, glabrescent, hairs appressed, silky, 0.1 mm. Male flowers: pedicel 10-16 by 1.5-2 mm, bracteole (?broadly rounded), caducous, scar conspicuous; buds (broadly) ellipsoid, 9-16 by 6-9 mm, hardly collapsing on drying, cleft c. 1/2, lobes 5-7 mm long, 1 mm thick. Androecium (broadly) obconical or cylindrical, 5-10 mm long; androphore 1-2 by 0.8-1 mm, (sub)glabrous (hairs 0.1-0.2 mm); synandrium 4-8 by 3-4 mm, apex rounded or ± truncate, sometimes ± triangular, thecae 30-40, sterile apex absent, or apex sometimes shallowly hollowed. Female flowers: pedicel 5 mm long; buds ovoid, 8 by 6 mm; ovary ovoid, 6 by 4.5-5 mm, hairs (0.5-)l(-2) mm. Infructescences: peduncle smooth or flaky. Fruits generally single, (broadly) ellipsoid or oblong, 6-8 by 4-5 cm, apex (sub)obtuse, (late) glabrescent, hairs mealy, rust-coloured, 0.5-l(-2) mm long; pericarp 5(-10) mm thick; seeds ellipsoid or oblong, 3.5 cm; fruiting pedicel 5-8 by 3-5 mm, striate, glabrescent.
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