Tree 10-25 m. Leaves coriaceous, oblong to lanceolate, (15-)25-55 by (2.5-) 5-14 cm, base rounded to cordate, or sometimes attenuate, apex (long-)acute; Inflorescences: Fruits l-2(-4) per inflorescence, ovoid or ellipsoid, 3-6 by 2.5-3.8 cm, with dark brown hairs 1-2 mm long;
Aceh present, Asia-Tropical: Malaya (Peninsular Malaysia present); Sumatera (Sumatera present), E Coast present, Johore present, Perak present, Selangor present, Tapanuli present, Trengganu present, W Coast present
Malesia: Sumatra (Aceh, Tapanuli, W Coast, E Coast), Peninsular Malaysia (Perak, Trengganu, Selangor, Johore).
1 Knema mandaharan is variable in the distinctness of the venation of the upper leaf surface, and size of the fruits and the thickness of the pericarp. In the material from N Central Sumatra possibly two forms can be distinguished, e. g., stout plants, with thick twigs and large leaves with faint venation above, the fruits large, 4-6 cm long, with short-haired pericarp 4-8 mm thick; the other form in N Sumatra has smaller leaves with distinct venation above, with looser, more farinose hairs on immature leaves, smaller fruits, 3-4 cm long, with longer, more lanose indumentum, especially at the base of the fruits, and with the pericarp only 2-3 mm thick. In other material from Sumatra and Peninsular Malaysia these differences are not apparent, as most of these specimens have a distinct venation. 2 The aril in de Wilde 13769 is incised to nearly halfway, which is unusual in Knema.