Tree (5-)10-20 m. Twigs lined or faintly ridged or not, 1.5—4(—10) mm diameter, early glabrescent, hairs grey to brown, 0.1 mm; bark striate, not flaking; lenticels mostly inconspicuous. Leaves membranous, elliptic to oblong-lanceolate, 7-27 by 2.5-8.5 cm, base attenuate, apex acute-acuminate; upper surface usually minutely whitish pustulate, lower surface glabrescent, hairs stellate, 0.1 mm long; dots absent; midrib hardly raised above; nerves 7-16 pairs, above thin, flat, lines of interarching faint; venation lax, faint on both surfaces; petiole 6-12 by 1.5-2.5 mm; leaf buds 10 by 1-2 mm, with hairs 0.1 mm long. Inflorescences with sparse or dense rather woolly hairs 0.1-0.3 mm; in male: 2-4 times branched, many-flowered, 5-12 by 4-8 cm, peduncle 1-2.5 cm; female 4-12 cm long; bracts 1—2(—3) mm long, caducous; flowers (male) in clusters of 2-5; perianth 2-lobed, with sparse or dense stellate hairs 0.1 mm long; pedicel slender, finely pubescent, not articulated. Male flowers: pedicel 1-2 mm long; buds little to much flattened, subcircular or slightly transversely or longitudinally elliptic, (1-) 1.2-1.8 by 1.2-1.9 mm, apex broadly rounded, base rounded or short-attenuate, cleft 1/3-1/2, lobes 0.1 mm thick; androecium flattened, subquadrangular in outline, 0.7-1.2 by 0.6-1.1 mm, apex broadly rounded (Plate 1: 30); thecae 16-20, (sub)erect, sessile, free apices to 0.1 mm long, column narrowly hollowed for 1/5-1/4; androphore up to 0.1 mm, broadly attached. Female flowers: pedicel 2 mm long; buds broadly ellipsoid, 2.8 by 2.5 mm, cleft 1/2-2/3; ovary globose to ovoid, 1.5 by 1.3 mm, with hairs 0.1 mm or less, style and stigmas 0.1 mm long. Fruits (2-)5-20 per infructescence, globose or short-ellipsoid, 1.1-1.6 by 1.1-1.6 cm, glabrescent but with minute persistent hairs towards the base (lens!), without or with few tubercles; pericarp often ± woody, thickest at one side, 1-3 mm thick; seed ellipsoid; fruiting pedicel 1-5 mm long; perianth not persistent.