Tree 8-20 m. Twigs 3-4(-6) mm diameter, early glabrescent, hairs greyish, 0.1 mm or less; older twigs coarsely striate, tending to crack, often with scattered conspicuous lenticels. Leaves coriaceous, (obovate-)oblong, 9-20 by 3.5-7.5 cm, base (short-)cuneate, apex acute or ± blunt; upper surface olivaceous brown, lower surface glabrescent, hairs interwoven, scale-like, 0.1 mm; possibly papillose, papillae irregularly shaped; dots absent; midrib above somewhat raised, lateral nerves 15-20 per side, at 45-60° to the midrib, sunken above, lines of interarching and venation distinct; petiole comparatively long, 15-30 by 2-3(-3.5) mm; leaf bud 8-15 by 3-4 mm, hairs grey-brown, 0.1 mm. Inflorescences among the leaves or below, of the Knema-typc; in male: simple, or 2-or 3-furcate scar-covered brachyblasts to 15 mm, peduncle absent or up to 5 mm, sometimes with a central axis to 4 mm, ± glabrescent, hairs sparse, 0.1-0.2 mm, with subumbels of 5-10(-20) flowers, buds of various sizes; female inflorescences: smaller, few-flowered; flowers with rusty hairs 0.1(-0.3) mm. Male flowers: pedicel ± stout, 2.5-4.5 mm, bracteole ovate, 2-2.5 mm, caducous; buds ovoid, 4-5(-6) by 3(-4) mm, cleft c. 1/3, lobes ± pergamentaceous, 0.2-0.3 mm thick, at anthesis suberect or ± curved outwards. Androecium 3-3.5 mm; androphore 1.5(—1.7) by 0.5 mm, hairs sparse, in the lower half pale brown, 0.3-0.4 mm; synandrium 1.5-1.7 by 0.6 mm, thecae 10-20, when old slightly projecting at apex, sterile apex blunt or acute, 0.1-0.3 mm, glabrous. Female flowers (seen only in one female flower amongst male flowers in Liao Taiwan FN 10579): buds subsessile, 3.5 by 3 mm; ovary ovoid, 2 mm diameter, with dense golden brown hairs 0.2 mm. Fruits single or 2 per infructescence, broadly ellipsoid to nearly globose, 3-4 by 2.5-4 cm, hairs dense, rust-coloured, mealy, 0.1-0.2 mm; pericarp 4-10 mm thick; seeds 2.5 cm; fruiting pedicel 2-5 mm.
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