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Large woody climbers with all parts bearing white latex. Branchlets weakly lenticellate or not, pubescent at least when young. Leaves opposite; Inflorescence an umbelliform panicle formed from terminal and axillary cymes; Sepals with colleters in a row at base inside, only at edges of sepals at base inside or without colleters. Stamens inserted in lower half of tube or almost in the middle of tube; Fruit of paired follicles; Seeds consisting of a flattened grain and a coma directed towards the fruit apex.


Asia-Tropical, continental Southeast Asia present, western Malesia present
5 species in continental Southeast Asia and western Malesia. In Malesia 3 species.


The species in this genus are somewhat heterogeneous and possibly do not form a monophyletic group.


D.J. Middleton 1999 – In: Fl. Thailand. p 118
K. Schum. 1895 – In: Engl. & Prantl, Nat. Pflanzenfam. 4. p 178
Benth. & Hook.f. 1876 – In: Gen. Pl. p 717
Wight 2004 – In: Tree Fl. Sabah & Sarawak. p 12
Wight 2005 – In: Harvard Pap. Bot. p 68
Pit. 1933 – In: Lecomte, Fl. Indo-Chine 3. p 1232
Pichon 1950 – In: Mém. Mus. Natl. Hist. Nat. p 103