Tree 6-15 m. Twigs 0.7-1.5(-3) mm diameter, early glabrescent, hairs 0.2-0.3(-0.5) mm; older twigs not flaking, without or with few indistinct lenticels. Leaves membranous or thinly chartaceous, 9-19 by 4-6.5 cm, elliptic(-oblong), base (short) cuneate, apex acute(-acuminate); upper surface dark brown, below greyish, seemingly glabrous, but hairs grey-brown, scale-like, scattered, 0.1 mm or les; not papillose; dots absent; midrib above sunken, lateral nerves 6-13 per side, at 45(-60)° to the midrib, slender, and sunken above, nerves below brown, contrasting in colour, lines of interarching and venation indistinct; petiole 5-12 by 1(—1.5) mm; leaf bud 6-9 by 1—1.5(—2) mm, hairs rough, 0.3(-0.5) mm. Inflorescences between the leaves or below, approaching the Knema-type; in male: peduncle slender, (3-)5-10 mm, pubescent, ending in 1-3 slender scar-bearing brachyblasts to 5 mm long, each with a loose subumbel of 2-4 flowers, buds of various sizes; female inflorescence not known; flowers with rough hairs 0.2-0.3 mm. Male flowers: pedicel slender, 4-5 mm long, bracteole broadly reniform, 2 mm long, persistent; buds ovoid(-oblong), 3.5-4 by 2.5 mm, cleft nearly 1/2, lobes 0.2(-0.3) mm thick. Androecium 2.5 mm long; androphore well-demarcated from synandrium, 0.5-0.6 by 0.3-0.4 mm, with hairs 0.2 mm in the lower half; synandrium ovoid-ellipsoid, 2 by 1-1.2 mm, thecae c. 16, 1.5 mm long, the sterile apex comparatively large, blunt, 0.5 mm. Female flowers and fruits not seen.
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