Woody climbers containing white latex in a laticiferous system which extends throughout the plant. Leaves ± ovate to elliptic, base 3-5-nerved, petioles usually long, bent and swollen at base and sometimes at apex, upper surface when dry revealing the laticiferous system as a fine, dense network of ± parallel ridges. Inflorescences racemose arising from old, leafless stems, usually ferrugineous-tomentose.
Asia-Temperate: China South-Central (Yunnan present), Asia-Tropical: Assam (Assam present); Thailand (Thailand present), Burma present, Lesser Sunda Is absent, Nicobar Is present
Assam, Burma, Nicobar Is., Thailand, Yunnan, Indochina; almost throughout Malesia, except the Lesser Sunda Is. Monotypic.