Abstract

This taxonomic study of the genus Ototropis in Thailand is based on the specimens from 30 European and Asian herbaria and field surveys. We recognize six species: O. amethystina, O. hayatae, O. kingiana, O. megaphylla, O. multiflora and O. sequax. We provide a key to the species, species descriptions, lists of specimens examined, distribution, ecology and vernacular names for all six species. Eight names are lectotypified: Desmodium amethystinum, D. angulatum, D. hamulatum, D. mairei, D. megaphyllum, D. multiflorum, D. pseudarthrioides and D. sequax.