Tree 10-20 m. Twigs 1.5-3 mm diameter, early glabrescent, hairs pale rusty, 0.1 mm; older twigs striate, not flaking; lenticels absent or few. Leaves membranous or thinly chartaceous, elliptic-oblong or oblong-lanceolate, 9-29 by 2.5-7.5 cm, base short-attenuate, apex gradually narrowed, acute-acuminate, or bluntish; upper surface olivaceous-brown, lower surface often greyish, pubescent or glabrescent, hairs lax or dense, 0.1 mm, with or without few scattered émergents 0.2-0.3 mm; papillose; dots absent; lateral nerves 10-18 per side, at (30-)45° to the midrib, above flat or sunken, below with lines of interarching and venation sometimes faint; petiole 10-30 by 1—2(—3) mm; leaf bud 10-15 by 1-1.5 mm, with hairs 0.1 mm. Inflorescences pedunculate, sometimes compound (see under the subspecies), axillary to leaves or to caducous cataphylls, with hairs 0.1-0.3 mm; bracts 1-1.5 mm, caducous; in male: twice branched, 3-6 by 3-5 cm, peduncle to 20 mm, ± angled or flattened, branches usually subopposite, with clusters of 2-7 flowers, buds of different sizes; female inflorescences: few-flowered, 1-1.5 cm long, peduncle 0.5-1 cm; flowers with dense grey-brown hairs 0.1-0.3 mm. Male flowers: pedicel slender, 2-3 mm, bracteole broadly ovate or subcircular, 1-1.5 mm, caducous; buds ellipsoid, not angled, 3(-3.5) by 2 mm, apex rounded, base attenuate to rounded, cleft 1/3, lobes suberect or spreading, 0.2-0.4 mm thick. Androecium 2.5 mm; androphore 1 mm, subglabrous or for the larger part with pale hairs less than 0.1 mm; synandrium ± oblong, (1-) 1.5-2 by 0.6-0.7 mm, thecae 6-10, sterile apex blunt, to 0.1 mm, glabrous or with a few minute hairs, or central column to 0.2 mm hollowed. Female flowers: pedicel 1.5 mm; perianth (broadly) ovoid, 2 mm; ovary ovoid, 1.8 by 1 mm, appressed short-pubescent. Fruits single or in pairs, subglobose, ellipsoid or oblong, 3-4.7 by 2-3.5 cm, ± glabrescent, hairs rusty, 0.1 mm or less; pericarp 3-4 mm thick; seeds 2.5 cm; fruiting pedicel 3-5 mm.
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