Tree 5-35 m. Twigs subterete to angular or ridged, (2-)2.4-4(-5.5) mm diameter, hairs 0.1 mm or less, early glabrescent, bark chocolate, later on brown or grey, finely cracked, with many lenticels. Leaves chartaceous or coriaceous, elliptic to oblong-lanceolate, widest at or below the middle, 14-33 by (5.5-)6-13 cm, base (short-)attenuate to broadly rounded, apex (acute-)acuminate, blade coarsely undulate on drying, margin not revolute; upper surface olivaceous to brown, sometimes glossy, lower surface grey (-purple) to brownish, with scattered appressed minute hairs, glabrescent; midrib above somewhat sunken (grooved) above, 1.5 mm wide, nerves 10-18 pairs, at (35-)40-50 (-55)° to the midrib, yellowish, distinct and (very) prominent below, venation sometimes distinct at the lower surface; petiole 8-20 by 1.5-3 mm; leaf buds 5-10 by 1.5-4 mm, with dense greyish hairs 0.1 mm. Inflorescences paniculate, with (grey-)rusty ± woolly hairs 0.2-0.4 mm long; in male 4-12 cm long, up to 8 cm wide, many-flow-ered, in female 1-4 cm long, 1-3 cm wide, generally fewer flowered; bracts triangular, 3 by 3.5 mm, pubescent, caducous. Flowers grey-rusty pubescent inside and outside, hairs 0.1-0.2 mm long. Male flowers: pedicel 2-3 mm long; buds ellipsoid-oblong, 2.5-4 by 1.5-2 mm, cleft 1/3-nearly 1/2, lobes 3 (or 4), (long-)triangular, only slightly spreading, tube 1.5-2.3 mm long; androecium ± truncately ellipsoid-oblong, stiped to 0.2 mm long, 1.5-2.3 by 1 mm; anthers 6-10, subsessile, often somewhat twisted, free apices 0.3-0.5 mm long, ± erect. Female flowers: pedicel 2 mm long; buds ovoid or pyriform, 2-2.5 by 1.7-2 mm, cleft to c. 3/4, lobes (2 or) 3, strongly spreading or recurved, tube short-urceolate, 0.5-0.7 mm long; ovary subglobose, 1-1.3 mm diameter, densely minutely pubescent; stigma sessile, minutely 2-lobed. Fruits 4-25 per infructescence, ellipsoid-oblong, 1.8-2.4 by 1-1.4 cm, (early) glabrescent or short-pubescent, hairs 0.1 mm; pericarp 1 mm thick; fruiting pedicel 4-10 mm long.
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