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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.


FORMAN 1985: p. 542. – In: Kew Bull.: f. 1
Diels 1910 – In: Pfl. R.: 115
HOOK.f. & TH. 1871 – In: Contr. Bot.: 44
MIERS 1864 – In: Ann. Mag. Nat. Hist.: 489