Tree 15 m. Twigs 4-5 mm diameter, subterete with faint lines from petiole to petiole, light brown, partially hollow with incidental ant-holes, without swellings, early glabres-cent, hairs minute, bright brown, less than 0.1 mm; older twigs striate with scattered lenticels. Leaves chartaceous, (elliptic-)oblong, 20-32 by 8-13 cm, base broadly rounded or shallowly cordate, apex acute(-acuminate); upper surface olivaceous, lower surface with persistent indumentum, hairs dense, pale, 0.1 mm or less; not papillose; dots absent; midrib slightly raised above, lateral nerves 20-23 per side, at 60-80° to the midrib, flat or sunken above, lines of interarching and venation indistinct; petiole 20-40 by 5 mm; leaf bud slender, 15-20 mm, hairs dense, brown, stellate, 0.1 mm or less. Inflorescences between the leaves or below, of the Knema-type: a simple or forked brachyblast, to 10 mm long, with stout peduncle to 5 mm, glabrescent; in male: with clusters of 10 (-20) flowers, buds of various sizes; bracts minute, caducous; in female: with sessile clusters, 5-10-flowered; flowers with yellow brown mealy hairs 0.1(-0.2) mm. Male flowers: stout, pedicel 10-11 by 1.5 mm, bracteole ovate-broad-triangular or rhomboid, acute, 4-4.5 mm, (sub)persistent; buds oblong, (10-) 12 by 4-5 mm, apex ± blunt to acute, base somewhat tapered, cleft 1/3, lobes ± fleshy, 4 mm long, 0.5(-0.8) mm thick, perianth inside for the lower 1/3 finely iregularly warted. Androecium (8-)10 mm long; androphore slender, 5-6 by 0.8 mm, in lower half with pale hairs less than 0.1 mm; synandrium oblong, subacute, 4-5 by 1.5-2 mm, thecae c. 17, sterile apex glabrous, ± acute, 0.2-0.3 mm. Female flowers: pedicel 2(-2.5) mm long, bracteole ovate, ± hooded, 2.5 mm long, (sub)persistent; buds ovoid(-oblong), narrowed in the apical part, 8 by 4-5 mm, lobes 1.5 mm; ovary ovoid, tapering, (including 1.5 mm long stigma lobes) 5 by 3 mm, hairs appressed 0.1(-0.2) mm. Fruits in sessile clusters of 1-3, (ovoid-) oblong, 3.5-5 by 2.5 cm, apex acute, base broadly rounded, hairs rusty, 0.5 mm; pericarp 5 mm thick; seeds ellipsoid-oblong, 2.5-3 cm; fruiting pedicel 1-3 mm.
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