Tree 10-35 m. Twigs (grey-)brown, 1.5-4(-10) mm diameter, with minute grey-brown hairs 0.1 mm long, early glabrescent, bark striate, on older twigs sometimes longitudinally cracking, lenticels very inconspicuous. Leaves membranous or chartaceous, elliptic to oblong, 8-30 by 4-13.5 cm, base subcordate or rounded to short-cuneate, apex acute-acuminate; upper surface dark brown, glabrous, lower surface early glabrescent; midrib on both surfaces early glabrescent, above flat or slightly raised; nerves 11-19 pairs, lines of interarching distinct or not; venation lax, distinct or not on both surfaces; petiole 8-30 by 1.5-4 mm; leaf bud 6-25 by 1-3 mm, with dense (grey-)brown hairs 0.1-0.2 mm long or less. Inflorescences predominantly with male flowers, generally behind the leaves, (sub)glabrescent or with sparse greyish hairs 0.1 mm or less, variable in shape, loose or condensed, many-flowered, 6-25 by 3-15 cm, peduncle 0.5-6 cm long, bracts caducous, not seen. Flowers in loose or dense clusters of 3-8, all in about the same stage of development; perianth outside with ± sparse greyish hairs 0.1 (-0.2) mm, or glabrous, lobes inside with pale hairs 0.2-0.3 mm, often in longitudinal rows. Male flowers: pedicel 1.5-2.5 mm; bud broadly ellipsoid-obovoid, 1.5-1.6 by 1.3-1.4 mm, apex broadly rounded or somewhat depressed, base ± tapering, subcircular in cross section, cleft 3/4-4/5, lobes 3 or 4 (or 5), at sutures 0.2(-0.3) mm thick; synandrium depressed globose, 0.3-0.5 by 0.5-0.6 mm, anthers 4-6, androphore 0.3-0.4 by 0.3 mm. Female flowers not seen; ovary in very immature fruits glabrous. Fruits (solitary or) 2-6 together in panicles of 15-25 cm long, ellipsoid-oblong, (4.5-)5-7 by 2.5-3.5 cm, apex (narrowly) rounded, base rounded or narrowed for 3-5 mm, glabrous, drying dark brown or blackish, finely granulate; pericarp 2-10 mm thick; fruiting pedicel 15-20 mm long; aril laciniate for c. 1/3 to nearly halfway; seeds ellipsoid-oblong, 4-5 cm long, apex subacute or bluntly beaked for up to 3 mm long, testa purplish brownish variegated.
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