The genus Codariocalyx Hassk. in Thailand is revised. Three species viz. C. gyroides (Roxb. ex Link) X.Y.Zhu, C. microphyllus (Thunb.) H.Ohashi and C. motorius (Houtt.) H.Ohashi are recognized. A key, descriptions, photographs, distribution maps, ecological and phenological data and vernacular names are provided. The anatomy of the leaf and stem are also presented.
