Tree 4-6 m. Leaves (thinly) chartaceous, oblong, 15-35 by 4-10 cm, base narrowly rounded or cuneate, apex (acute-)acuminate; Inflorescences: Fruits 2.5-3 by 1.7-2 cm, obtuse, with hairs 0.5-1 mm, fruiting pedicel 10 mm.
Asia-Tropical: Borneo present, W & Central Kalimantan, area of the upper Katingan: Mendawai and Kahayan Rivers present
Malesia: Borneo (W & Central Kalimantan, area of the upper Katingan: Mendawai and Kahayan Rivers).
Knema krusemaniana belongs, with K. conferta and K. pedicellata, to a group of species with dots on the lower leaf surface. It is distinguishable by thinner leaves, twigs with longer-haired persistent conspicuous indumentum, and smaller male flowers, with only 8 anthers. The perianth in K. krusemaniana is 4-lobed, in the related K. conferta and K. pedicellata it is 3-lobed and 4- or 5-lobed, respectively. The pedicels are exceedingly long in K. pedicellata, short in K. krusemaniana. The staminal disc is conspicuously convex in K. pedicellata, ± flat in K. krusemaniana and K. conferta; in K. pedicellata the perianth has a raised disc at base, which is lacking in both other species. Finally there are remarkable differences in the almost stalked anthers: 8 in K. krusemaniana, which are uniquely 4-sporangiate; in K. conferta and K. pedicellata there are (10—)12— 18 bisporangiate anthers.