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Trees, often growing to enormous size; Branchlets usually strongly longitudinally ribbed when young, occasionally weakly so. Leaves in whorls; Inflorescence of umbelliform or paniculate cymes; Sepals with colleters inside; Stamens free from the style head; Fruit of paired, divergent follicles, these heavy and woody, dehiscing at maturity. Seeds elliptic, flattened;


southern Thailand present, western Malesia present
2 species in western Malesia andsouthern Thailand.


Both species were previously tapped for making rubber and for the manufacture of chewing gum but this industry has greatly declined. Both also have a soft and easily worked timber but which is not durable. The wood is used for smaller items like pencils, picture frames, carving, toys, furniture parts, packing cases etc.


Monach. 1946 – In: Lloydia: 182
D.J. Middleton 1999 – In: Fl. Thailand: 36
Pichon 1949 – In: Mém. Mus. Natl. Hist. Nat.: 190
K. Schum. 1895 – In: Engl. & Prantl, Nat. Pflanzenfam. 4: 139
D.J. Middleton 2003 – In: Gard. Bull. Singapore 55: 210
Backer & Bakh.f. 1965 – In: Fl. Java: 227
Hook.f. 2000 – In: PROSEA: 65
Hook.f. 2004 – In: Tree Fl. Sabah & Sarawak: 27