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Revision of Trigonostemon (Euphorbiaceae) of Malaya, Sumatra and Borneo

This revision is based on a rich collection received from Singapore, together with the material available in the herbarium of The New York Botanical Garden. The number of species of Trigonostemon recorded from Malaya, Sumatra and Borneo is at present twenty-six. Of these only eleven are based on complete material available for the present study; the other fifteen species are inadequately known and have been classified and included in the key only tentatively.