Asia-Tropical: Borneo present, W Kalimantan present
Malesia: most of Borneo (according to Sinclair W Kalimantan, but no specimens seen).
Gymnacranthera forbesii var. crassinervis usually is easily recognized and distinguished from var. forbesii and other species of Gymnacranthera by its stout twigs and leaves and usually strong orange-yellowish lateral nerves, which are very distinctly raised on the lower leaf surface. Gymnacranthera bancana also is a stout species, but leaves and young twigs are always rusty tomentose, whereas the present variety is almost glabrous.