Tree 15-35 m. Twigs (4-)5-8 mm diameter, early glabrescent, indumentum minute; older twigs becoming rough and scaly, not longitudinally cracking; lenticels often present but indistinct. Leaves membranous, chartaceous or (thinly) coriaceous, elliptic or oblong-lanceolate, 16-40 by (6-) 10-20 cm, base rounded or shallowly cordate, sometimes attenuate, apex acute-acuminate; upper surface (blackish) brown, sometimes bullate, lower surface (brownish) grey, seemingly glabrous, but actually minutely pubescent, or glabrescent, hairs interwoven or sparse, grey-brown, scale-like, 0.1 (-0.2) mm or less; usually papillose; dots absent; midrib flat or raised above, lateral nerves 23-33 per side, at 60-70° to the midrib, flat or impressed above, lines of interarching and venation distinct (or indistinct) on both surfaces; petiole 25-35 by 2.5-4 mm; leaf bud 15-20 by (3-)4-5 mm, hairs 0.1 mm or less. Inflorescences usually between the leaves, subglabres-cent, indumentum minute, grey-villous, essentially paniculate, stout, the peduncle distinctly flattened, sometimes lenticellate; in male: 6—12(—18) by 3-8 cm, peduncle 20-45 by 4-6 mm; lower branches up to 3 cm, central axis 4-8 cm long, with up to 6 side branches, subumbels shortly stalked or sessile, each with 5-10 flowers, buds of various sizes; bracts caducous; female inflorescences smaller, 5-9 cm long, subumbels 1-5-flowered; flowers coriaceous, thinly with brown-grey hairs less than 0.1 mm. Male flowers: pedicel 3-10 mm long, bracteole broadly reniform, angular, or 2-to 3-topped, subumbels 1.5-2 mm, with ciliate margin, persistent; buds (ovoid-)ellipsoid, 5-7 by 4-5 mm, cleft c. 1/2 or slightly over, lobes 0.7 mm thick. Androecium 3-4.5(-5) mm; androphore 0.5-0.8(-l) by 0.8-1 mm, finely pubescent in the lower half; synandrium ± cylindrical, 2-2.5 by 1-1.2 mm, thecae 16-24, sterile apex ± blunt, 0.3-0.5 mm. Female flowers: pedicel stout, l-3(-4) mm long, bracteole broadly rounded, 2(-3) mm, persistent; buds ovoid, 5-7 by 4-6 mm, cleft 1/3 to halfway; ovary ovoid, 3-4 mm, hairs ap-pressed, 0.2-0.4 mm, stigma lobes (0.5-)1 mm long. Fruits 1-4 per infructescence, ellipsoid-oblong, (4.5-)6-9 by 3.5-5 cm, base sometimes narrowed, hairs mealy, dark brown, 0.1 mm or less, sometimes late glabrescent; pericarp 10-15 mm thick; seeds ellipsoid-oblong, (4-)4.5-6 cm, aril in lower 1/4 sometimes undivided; fruiting pedicel stout, 3-10 mm long.
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