Glabrous except for the ovary shortly tomentose and more or less tuberculate and the distal part of the corolla weakly to strongly papillose in bud. Leaves opposite; lamina narrowly obovate to spathulate, 3-4 by 1-2 cm, attenuate at the base to a petiole 1-3 mm long, rounded at the apex, dull on both sides; venation almost curvinerved with the midrib and the main laterals visible above and only the midrib prominent below. Inflorescences at the nodes, an umbel of 1 pair of flowers, sometimes extended as a raceme of 2 pairs of flowers; axis 1.5-6 mm long; pedicels 1-2 mm long; bracts small, the lateral ones usually connate.
Asia-Tropical: Borneo (Sarawak present); Malaya (Peninsular Malaysia present, Singapore present)
Malesia: Peninsular Malaysia, Singapore, Borneo (Sarawak).