Tree 5-15 m. Leaves coriaceous, (oblong-)lanceolate, base attenuate, rounded, cordate, or subtruncate, apex subobtuse or acute-acuminate, 12-28 by 4-8.5 cm, drying brown, with scattered hair scars above; Inflorescences: Fruits 1 (or 2?) per infructescence, almost globose, 3-4 cm diameter, with hairs 0.2 mm long;
Asia-Tropical: Malaya (Peninsular Malaysia present), Pahang present, Selangor present
Malesia: Peninsular Malaysia (Pahang, Selangor).
Knema rigidifolia is a montane species, characterized by coriaceous leaves and globose fruits. The male flowers of the two specimens known differ in shape, consistency, and morphology, related to differences in general habit, leaf shape, and distribution. By the differences in the male flowers in the two here accepted subspecies, K. rigidifolia keyed out on two places in the general key to the species.