Tree 5-25 m. Leaves membranous or chartaceous; Inflorescences: Fruits 1-5 per infructescence, subglobose or obovoid, apex rounded to subacute, base rounded, sometimes ± attenuate, (1.2—)1.5 by 0.7-1 cm, with rusty scale-like hairs 0.1 mm long or less;
Asia-Tropical: Borneo present; Malaya (Peninsular Malaysia present); Sumatera (Sumatera present)
Malesia: Sumatra, Peninsular Malaysia (subsp. stenophylla), Borneo (subsp. longipedicellata).
2 The variability in K. stenophylla abounds in the venation on the upper leaf surface, which can be either distinct, indistinct, or invisible; the length of the male and female pedicels, the diameter of the male buds, and the number of anthers, varying from 6 to 11. These characters show some overlap with K. malayana, which differs in the generally thinner and broader leaves with a very distinct venation on the upper leaf surface, generally larger male flowers with longer pedicels, and the indumentum of the fruits which is more farinose. Knema patentinervia has larger male flowers, K. subhirtella has larger fruits. 1 Knema stenophylla resembles K. cinerea, K. glauca, K. hirtella, K. malayana, K. patentinervia, and K. subhirtella', for differences see the key to the species.