The Trigonostemon species outside Malesia are taxonomically revised based on herbarium collections and fresh material. The research history in the concerning regions, i.e., the Indian subcontinent (including S India, Sri Lanka, Bangladesh and Myanmar), China, Thailand, Indochina, NE Australia and New Caledonia, is briefly summarised. A total of 32 species are accepted (including one doubtful species) and 17 names are newly treated as synonyms. Trigonostemon montanus is newly described for India. Regional identification keys, nomenclature, descriptions, geographic distributions and taxonomic notes are provided. Together with our previous work, the genus is now fully revised. A total of 59 species are accepted. A full identification list of all Trigonostemon collections seen is presented.

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Naturalis Biodiversity Center
doi.org/10.3767/blumea.2020.65.01.04
Blumea: Biodiversity, Evolution and Biogeography of Plants
Naturalis journals & series

Yu, R.-Y., & van Welzen, P.C. (2020). A taxonomic revision of Trigonostemon (Euphorbiaceae) outside Malesia. Blumea: Biodiversity, Evolution and Biogeography of Plants, 65(1), 25–52. doi:10.3767/blumea.2020.65.01.04