Woody climbers. Leaves sometimes peltate. Inflorescences supra-axillary and cymose (but not in Malesia), or cauliflorous and composed of a raceme of cymes. Seed (Mal. spp.) narrowly horse-shoe-shaped, sharply curved around the deeply intrusive narrow condyle;
Asia-Tropical, Lesser Sunda Is, S. China present, W. New Guinea present, tropical continental SE. Asia present
3 spp. in tropical continental SE. Asia and throughout Malesia as far as W. New Guinea, not yet recorded from the Lesser Sunda Is. The third species in S. China.
The only constant difference between the two Malesian species is in the fruits. No floral or inflorescence differences were found.