Tree 10-40 m. Twigs brown, 3.5—5(—14) mm diameter, with rusty hairs 0.5 mm long, early to late glabrescent, bark coarsely striate, tending to flake, lenticels absent or inconspicuous. Leaves membranous to thinly chartaceous, elliptic-oblong to oblong-lanceolate, 18-38 by 6-11 cm, base subcordate, broadly rounded, or short-cuneate, apex acute-acuminate; upper surface drying brown, glabrous, lower surface early glabrescent; midrib on both surfaces often late glabrescent, above rather flat to moderately raised; nerves 17-25(-30) pairs, above (partly) raised, sometimes late glabrescent, lines of interarching often distinct and regular; venation lax, distinct or faint above; petioles 8-25 by 1.5-3 mm, ± late glabrescent; leaf bud 8-18 by 2-3.5 mm, with dense rusty hairs 0.3-0.5 mm. Inflorescences (with male or mixed male and female (?) flowers) between or behind the leaves, sometimes apical, 3-5 times branched, many-flowered, 8-30 by 5-25 cm, peduncle 1.5-5 cm, with dense rusty hairs 0.5-0.7 mm long, bracts elliptic-oblong, 2-6 mm long, caducous. Flowers usually in rather dense clusters of 5-10, sometimes flowers more dispersed and only 2 or 3 together, all ± in the same stage of development; perianth outside with hairs 0.2-0.5 mm long, lobes inside with dense rusty hairs 0.2-0.3 mm. Male flowers: pedicel slender, 2-3.5 mm; buds obovoid to ± obconical, 1.5-1.8 by 1.2-1.5 mm, apex rounded to subtruncate, base ± tapering, in cross section faintly angular or subcircular, pubescent or glabrescent towards the apex, cleft 3/4-4/5, the lobes (3 or) 4 or 5, oblong, 0.2 mm thick; synandrium depressed-globose, (0.2-)0.3 by 0.5-0.6 mm, anthers 4, sessile, androphore 0.3 by 0.2-0.3 mm. Female flowers not seen. Fruits 6-18 in large panicles up to 30 cm long, ellipsoid-oblong, 4.5-6.5 by 1.8-2.5 cm, apex narrowly rounded, base subacute or often tapering into a 4-10 mm long narrowed part, glabrous, drying blackish, finely granulate, without lenticels, not warted; pericarp 1.5-3 (-4) mm thick; fruiting pedicel 8-16 mm long; aril laciniate to 1/5-1/3; seeds ellipsoid-oblong, 3.5-4.5 cm long, apex beaked for 0.2-4 mm, testa with elongate purplish and brownish dapples.
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