Tree 20-40 m. Twigs somewhat angular, 4-8 mm diameter, early to late glabrescent, hairs 0.1 mm or less; older twigs coarsely flaking; with or without lenticels. Leaves (thinly) coriaceous, elliptic-oblong or oblong-oblanceolate, 16-44 by 8—14.5(—18) cm, base narrowly rounded or subcordate, apex ± blunt (rounded) or acute; upper surface olivaceous(-brown); lower surface yellowish, glabrous; papillose; dots absent; midrib above slightly raised, lateral nerves (16-)20-28 per side, at 45-60° to the midrib, sunken or flat above, lines of interarching sometimes distinct, venation fine-scalariform, distinct or not; petiole 20-50 by 3.5-5 mm; leaf bud 15-25 by 3.5-5 mm, hairs 0.1 mm or less. Inflorescences between the leaves or below, paniculate, pedunculate, hairs mealy, 0.1-0.2(-0.3) mm; in male: rather stout, 2-5 by 2-4 cm, peduncle 8-20 mm, lower branches to 15 mm, central axis similar, unbranched, each branch ending in a short brachyblast, with few flowers, size of buds strongly variable, in older inflorescences with dispersed scars of fallen flowers; bracts 2-3(-4) mm, caducous; female inflorescences like male but smaller; flowers coriaceous, with hairs 0.1 mm, sometimes late glabrescent. Male flowers: pedicel 5-8 mm, bracteole broadly reniform, 1.5-2 mm, caducous, apical or to 2 mm below; buds ellipsoid, 6-8 by 4-5 mm, cleft 2/3-3/4, lobes 0.5-1 mm thick. Androecium (4-)5-6 mm; androphore somewhat tapering, 1-2 by 1.5 (-2) mm, hairs dense, 0.1 mm; synandrium oblong, (2-)2.5-3 by 1.5 mm, thecae 18-24, sterile apex ± blunt or subacute, 0.3-0.6 mm. Female flowers: pedicel 2-4 mm, bracteole scar apical; buds ovoid, 6 by 4 mm, cleft 2/3-3/4; ovary (3-)4.5 by 3-3.5 mm, hairs 0.1 mm or less, stigma lobes sessile. Infructescences 1-3 cm long. Fruits 1 or 2, ellipsoid, 7-9 by 4.5-6 cm, with the style remnant ± lateral (always?), glabrescent, indumentum mealy, dark brown, hairs 0.1 mm (persistent at the very base); pericarp glossy blackish brown, 10-20 mm thick; seeds long-ellipsoid, 5-6 cm; fruiting pedicel stout, short, 4-10 mm long.
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