Seven new species of the genus Miliusa are described from Th ailand ( M. fragrans , M. hirsuta , M. intermedia , M. nakhonsiana , M. sessilis , M. thailandica , and M. umpangensis ). A key to the 19 species of Miliusa in Th ailand is provided. In addition, the complete taxonomic nomenclature of all known species of Miliusa in Th ailand is given, with several new proposed synonyms. Th e new as well as the known species of Miliusa in Th ailand are classifi ed into four morphological groups on the basis of a combination of fl ower and/or infl orescence position and inner petal morphology proposed earlier.