Tree (5-)10-35 m. Twigs angled or subterete, 1.5-3.5(-4) mm diameter, late glabres-cent, hairs yellowish brown or rufous, 0.3(-0.5) mm; older twigs grey-brown or blackish, ± transversely cracked, not flaking; lenticels small, indistinct. Leaves (membranous or) thinly chartaceous, elliptic-oblong or oblong-lanceolate, 9-22(-28) by 3.5-7(-10.5) cm, base short attenuate or rounded, apex acute(-acuminate); upper surface (blackish) brown, lower surface grey (-brown), hairs usually persistent on or near the midrib, especially towards the base, just or hardly touching each other, not densely interwoven, scalelike, grey or pale brown, 0.1 (-0.2) mm or smaller; not or but faintly papillose; dots absent; midrib hardly raised above, lateral nerves 10-20 per side, at 50-80° to the midrib, flat and faint above, lines of interarching and venation indistinct; petiole 8-13 by 1.5-2.5(-3) mm, late glabrescent; leaf bud 10-15 by 2-3 mm, hairs 0.2-0.3(-0.5) mm. Inflorescences among the leaves or below, of the Knema-type: peduncle to 3 mm, ending in a simple or forked, scar-covered, flower-bearing brachyblast to 5 mm, late glabrescent; in male: with a cluster of 5-15 flowers, buds of ± variable sizes; female inflorescences similar, l-3(-5)-flowered; flowers with dense rufous hairs 0.2-0.3 mm. Male flowers: pedicel 2-3 by 1 mm, bracteole small, caducous; submature buds obovoid-oblong, (4-) 5-6 by 2.5-3 mm, apex rounded, cleft c. 1/4, lobes 1.5 mm long, 0.3-0.5 mm thick. Androecium short-cylindrical, 3-4 mm; androphore 0.5-0.6 by 0.5 mm, largely glabrous, towards the base a collar of sparse or dense erect reddish brown hairs 0.4-0.5 mm; synandrium (2-)3 by 1 mm, thecae 14-16, sterile apex blunt, 0.2-0.5 mm. Female flowers: pedicel 4 by 1.5-2 mm; buds ovoid, 6(-7) by 4.5(-5) mm, cleft c. 1/4, lobes 1.5 mm long; ovary ovoid, 4 by 3 mm, brown pubescent. Fruits solitary, or 2 or 3 together, ellipsoid-oblong, 3-4.5(-6) by 2.5(-3) cm, apex rounded, base rounded or somewhat narrowed, hairs dense, bright (dark) rusty, 0.5-1 mm, rough especially towards the base of the fruit; pericarp 2-3 mm thick; seeds ellipsoid, 2-2.5 cm; fruiting pedicel 4-8 by (3-)4-5 mm, late glabrescent or with persistent indumentum, fissured.
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