Abstract:Five taxa of Euphorbiaceae from southern China are described.Acalypha wui H.S.Kiu and Trigonostemon wui H.S.Kiu are new species, which grow on limestone hills in the west part of Guangdong Province.Claoxylon subsessiliflorum Croiz.and Euphorbia reniformis B1.are new records for China.Euphorbia heterophylla Linn.is a naturalized weed in China,and E.epilobiifolia W.T.Wang is treated as synonym of E.heterophylla.