Tree to 30 or more m high. Leaves opposite and decussate, primary rachis including petiole 2-9 (-11.5) cm long. Flowers bisexual. Seeds c. 15 per pod, either circular in outline or elliptical and then lying diagonally across the width of the pod;
Asia-Tropical: Borneo present; Malaya (Peninsular Malaysia present); Sumatera (Sumatera present)
Malay Peninsula, Sumatra, and occasionally in Borneo. — .