Tree 10-25 m. Twigs 1.5-2(-3) mm diameter, early glabrescent, hairs 0.5-1 mm long; older twigs distinctly lenticellate. Leaves membranous or chartaceous, (elliptic-)oblong, 15-26 by 5-11.5 cm, base short-attenuate or narrowly rounded, apex acute-acuminate; upper surface brown, lower surface grey-brown, seemingly glabrous but late glabrescent, hairs thin, widely spaced, scale-like, 0.1 mm, mixed with few pale brown larger ones, 0.2 mm, the larger hairs leaving point-like scars; not obviously papillose; dots absent; midrib slightly raised above, lateral nerves 12-16 per side, at 45(-60)° to the midrib, flat or sunken above, on lower surface bright brown, contrasting in colour, lines of interarching distinct, venation faint or hardly visible; petioles 10-22 by 1.5-4 mm; leaf bud 10-15 (-20) by 2-3 mm, hairs silky, yellow-brown, (0.5-)l mm long. Inflorescences between the leaves and below, of the Knema-type: sessile, simple or forked ± woody scar-covered brachyblasts, with rusty hairs 1 mm; bracts caducous; in male: brachyblasts up to 5 mm, at apex with up to 5 flowers, buds not much variable in size; in female: brachyblasts smaller, 2 mm, 1-3-flowered; flowers ± glabrescent except at apex, hairs (0.2-) 0.3 mm. Male flowers: pedicel 8-10 mm, bracteole ovoid, subacute, 2-3 mm, caducous; buds subcylindrical, somewhat angled, (10—) 13—15 by 2.5-3(-3.5) mm, apex (sub)acute, base narrowly rounded, cleft 1/15-1/20, the lobes 0.5 mm long, 0.3-0.4 mm thick. Androecium elongate, 9-12 mm; androphore slender, (3-)3.5-4 mm, with dense hairs 0.5 mm; synandrium 6.5-7.5 by 0.4-0.5 mm, thecae 14-16, ± contiguous, sterile apex ± acute, (0.5-)l mm, glabrous. Female flowers: pedicel 4-6 by 1.5(-2) mm, bracteole 1.5-2 mm, caducous, scar about median; buds ovoid-oblong, 8-10 by 4-5 mm, narrowed towards subacute apex, apical part ± angled, base ± rounded, cleft 1/8, lobes 0.5 mm thick; ovary ovoid-oblong, 4 by 2-2.3 mm, with dense hairs 0.5-1 mm, style and stigma slender, 1.5-2 mm long, deeply 2-lobed. Fruits solitary, sometimes several together (on short-shoots with several inflorescences), subglobose or broadly ellipsoid, 5-6 by 3.5-4.5 cm, apex ± rounded or shortly beaked, base narrowly rounded and narrowed into a pseudostalk up to 5 mm, indumentum coarse-mealy, hairs dense, dark rust-coloured, 0.2-0.3 mm; pericarp hard-leathery or woody, often wrinkled or bullate on drying, 5-10 mm thick; seeds broadly or narrowly ovoid-ellipsoid, 2.5-3 cm, aril thick, fatty, deeply sunken into the seed leaving deep grooves when removed; fruiting pedicel stout, 10 mm long.
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