Tree 10-24 m. Twigs 3-4(-5) mm diameter, late glabrescent, hairs rufous, 0.5(-l) mm; older twigs blackish, longitudinally cracking and somewhat flaking; lenticels absent. Leaves coriaceous, elliptic-oblong to oblong-lanceolate, 9-20(-25) by 3.5-6.5(-9) cm, more or less tapering to the ± blunt or acute apex, base rounded, sometimes subcordate or short-acute; upper surface olivaceous-brown; lower surface with dense scale-like grey-brown or pale cinnamon hairs 0.1-0.3 mm, emergent hairs scattered, caducous, to 0.4 mm; not obviously papillose; dots absent; midrib above ± flat, with some indumentum towards the base, lateral nerves (11-) 14-19 per side, at 60-80° to the midrib, sunken but distinct above, lines of interarching and venation indistinct on both surfaces; petiole short, 5-10(-15) by 3-4 mm; leaf bud 7-10 by 3 mm, hairs rusty, 0.5-1 mm. Inflorescences of the Knema-typt; in male: sessile, simple or forked, woody, persistent, brachyblasts to 12 mm, hairs dull, rusty, 0.5 mm, flowers few, buds of different sizes; female inflorescences small, one-or few-flowered, bracts ± triangular, 1 mm; flowers with dense rusty woolly hairs 0.3-0.8 mm. Male flowers: pedicel 3-4 mm, bracteole broadly ovate-circular, 2-4.5 mm, blunt or acute, ± apical, late caducous; buds ovoid-ellipsoid, 4-5.5 by 2.5-4.5 mm, apex faintly angled or not, cleft 1/2, lobes ± coriaceous, 0.2(-0.8 at base) mm thick, at anthesis erect. Androecium 2.2-3 mm; androphore (0-) 0.2-0.4 by 0.5 mm, subglabrous but at base a dense collar of stoutish rusty hairs 0.5-0.8(-l) mm; synandrium subcylindrical, 2-3 by 0.6-0.8 mm, thecae c. 15, sterile apex irregularly shaped, ± blunt, 0.2-0.3 mm, hairs dense or sparse, pale brown, 0.1 mm or less. Female flowers (not fully known): buds ellipsoid, 5 by 3 mm, perianth lobes ± recurved; ovary (immature) ovoid, 2-3 mm, with bright rufous-red hairs 0.5-1 mm. Fruits usually solitary, subsessile, ellipsoid(-obovoid), 2.5-3.5 by 1.5-2 cm, hairs dense, ru-fous-red, fine-woolly, 0.5-1 mm, longest towards the base of the fruit; pericarp 1-2 mm thick; seeds ellipsoid, 2(-2.5) cm; fruiting pedicel stoutish, 2-4 mm.