Tree 15-25 m. Twigs subterete or angular, 2.5-5 mm diameter, yellowish or blackish brown, very early glabrescent, hairs pale, 0.1 mm or less; older twigs irregularly (longitudinally) cracking; lenticels few and indistinct, or absent. Leaves membranous or thinly chartaceous, (elliptic-)oblong(-lanceolate), (16-)24-35 by (5—)8—13.5 cm, base attenuate or acute, or narrowly rounded, apex acute-acuminate; upper surface olivaceous (-brown), lower surface grey-brown, glabrescent, indumentum minute, flat-lying, open cobweb-like, silvery; not obviously papillose; dots absent; midrib above flat, lateral nerves 16-24 per side, at (45-)60-80° to the midrib, slender, indistinct and flat or ± sunken above, much raised below, lines of interarching and venation indistinct on both surfaces; petiole 15-30 by 2.5-5 mm; leaf bud 10-15 by 2.5-3 mm, hairs appressed, 0.1 mm. Inflorescences among the leaves or just below, pedunculate, slender, almost glabrous, hairs scattered, 0.1 mm or less; in male: widely paniculate, 10-15 by 6-10 cm, peduncle 20-45 mm, somewhat flattened, lower branches subopposite, 10-35 mm, central axis with 3 or 4 branches, 15 mm or less; flowers in subumbels of 5-10, buds strongly varying in size; bracts caducous, not seen, their scars dislocated upwards along the branches; female inflorescences (from infructescences): smaller and fewer flowered, (1.5—)5—8 cm, including the 30-40 mm long peduncle. Male flowers: pedicel slender, 9-12 mm, bracteole broadly rounded-reniform, 2-2.5 mm, persistent; buds membranous, ovoid, 4(-4.5) by 3-3.5 mm, hairs sparse, grey-brown, 0.1(-0.2) mm, cleft nearly 2/3, lobes 3 mm long, 0.3 mm thick. Androecium club-shaped, 3-3.5 mm; androphore somewhat tapering, 1 by 1 mm, glabrous; synandrium ellipsoid(-oblong), 2 by 1-1.2 mm, thecae 16 (anthers rather spaced), sterile apex 0.2-0.3 mm, ± blunt. Female flowers not seen. Fruits 1 or 2 per infructescence, (elliptic-)oblong, 6-7 by 3-3.5 cm, rounded at both ends, with dense minute scurf of hairs 0.1 mm or less; pericarp 3-6 mm thick, dull brown; seeds 5-5.5 cm; fruiting pedicel 6-15 mm.
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