Tree 18-30 m. Twigs 1.5-3 mm diameter, somewhat angular, late glabrescent, hairs shaggy, up to 0.5 mm long; older twigs sometimes blistering or flaking; lenticels small, many or few. Leaves chartaceous, elliptic-oblong or oblong-lanceolate, (7-)9-17 by 2.5-7.5 cm, base rounded or attenuate, apex acute-acuminate; upper surface dark brown, lower surface brown-greyish, indumentum persistent (or late glabrescent), hairs mealy, stellate scale-like, 0.2 mm or less; not papillose; dots absent; midrib raised above, lateral nerves 13-17 per side, at c. 60° to the midrib, flat or sunken above, little raised below, lines of interarching and venation not distinct; petiole 12-15 by 2-3 mm; leaf bud 8-18 by 1.5-3 mm, hairs rufous, 1-1.5 mm long, ± erect or appressed, brownish grey, 0.1 mm (var. kosteriana) or longer. Inflorescences pedunculate, between the leaves or just below, hairs 0.1-0.2 mm, male not seen; in female: peduncle 4-8 by 2 mm (to 4 mm wide in infructescences), ending in 1 or 2 knob-like scar-covered brachyblasts 2 mm long, each with 1-3 flowers, buds of slightly various sizes; bracts small, pubescent, caducous; flowers subcoriaceous, with shaggy hairs of mixed sizes, (0.1-)0.2-0.3 mm. Male flowers not seen. Female flowers (slightly immature): pedicel 7-8 by 1.5-2 mm, broadening distally and ± gradually passing into the perianth; bracteole 1 mm or less, caducous, scar nearly ring-shaped, ± median; buds subellipsoid, broadest below the middle, 4-4.5 by 2.5(-3) mm, cleft c. 1/6, lobes 0.5 (-1) mm long, 0.5 mm thick; ovary ovoid-oblong, 3.5 by 1.5 mm, hairs 1-1.5 mm long. Fruits solitary or 2 or 3, ellipsoid-oblong, (2.5-)4 by 2 cm, apex ± acute, base contracted into a rather stout pseudostalk or not, hairs dense, mealy, brown, 0.1(-1) mm; pericarp ± woody, 4 mm thick; seeds ellipsoid-oblong, 2.2 cm (var. mediovibex); stipe (peduncle and fruiting pedicel) ± stout, 1.5 cm long, nearly 5 mm wide at base, striate, ± lenticellate, bracteole scar slender, ring-shaped, 5 mm below the fruit.
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