Tree 6-25 m. Leaves membranous or thinly coriaceous, oblong to lanceolate, 12-28 by 3.5-8.5 cm, base cuneate-attenuate to subobtuse, apex obtuse to acute-acuminate; Inflorescences: Fruits 1-3 per infructescence, ellipsoid or obovoid, 2.5-4.5 by 2-3.5 cm, at first with rusty indumentum, hairs c. 1 mm long, early glabrescent;
Asia-Tropical: Borneo present (Sabah present, Sarawak present), E & SE Kalimantan present
Malesia: Borneo (Sarawak, Sabah, E & SE Kalimantan).
Knema membranifolia resembles typical K. curtisii by the glabrescent yellowish twigs; that species, however, has terete twigs, non-flaking bark, and a different androecium. The closest alliance of K. membranifolia is possibly with K. korthalsii, which differs in non-flaking bark of twigs, generally larger (longer) leaves with more veins, flowers with persistent indumentum, 12-20 smaller anthers, and smaller fruits.