Tree 10-20 m. Twigs 2.5-5 mm diameter, in apical part flat and 2-angled, somewhat yellowish, lower down subterete, with two (faint) ridges or lines, glabrescent, hairs 0.1 mm long or less; bark finely striate, not flaking; lenticels rather small and inconspicuous. Leaves membranous, oblong-lanceolate, 10-30 by 4-10 cm, base attenuate, apex acute-acuminate; upper surface drying olivaceous-brown, with small paler pustules or not, almost always with larger irregular whitish marks, lower surface early glabrescent, hairs 0.1 mm long or less; dots absent; midrib above slender, flat; nerves 10-18 pairs, flat or slightly raised above, inconspicuous, lines of interarching not distinct; venation lax, indistinct; petiole 10-16 by 1.5-2.5 mm; leaf bud 10 by 2 mm with hairs 0.1 mm or less. Inflorescences with sparse or dense hairs 0.1 mm or less; in male: (2-)3-4 times branched, many-flowered, 5-8 by 4-8 cm; in female: 2-3 cm long; peduncle 0.5-1.5 cm; bracts not seen, caducous; flowers (male) 2-4 together, glabrous, perianth 2-lobed, pedicel not articulated. Male flowers: pedicel slender, 1.5-2 mm; buds laterally compressed, subcircular or transversely ellipsoid, or slightly reniform, dull and usually ± collapsed on drying, 2.5-3 by 3-4 mm, apex broadly rounded, base rounded or subtruncate, or shortly tapering, cleft 2/3-3/4, lobes 0.1-0.2 mm thick; androecium inflated, somewhat compressed, transversely ellipsoid, 1—1.5(—2) by 2.5-3.5 mm; anthers 12-15 (i.e., 12-15 thecae at both sides of the androecium) (Plate 1: 77); the thecae slender, almost free, at base attached to the rim of the androphore, 1.5-2 mm long, their upper halves deeply incurved almost to the base of the androecium, androphore ± tapering, 0.5-0.8 mm long. Female flowers: pedicel 2 mm long, thinly pubescent; buds ovoid-ellipsoid, 2-3 mm long, cleft c. 1/2; ovary globose-ovoid, 2 by 1.7 mm, glabrous, stigma 0.1 mm long or less. Fruits 1-3 per infructescence, ellipsoid, 1.5—2(—3) by 1.4-1.6 cm, glabrous, with scattered small tubercles or lenticels; pericarp 1.5-2 mm thick; fruiting pedicel 3-5 mm long; perianth not persistent.
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