the genus phyllanthus occurs worldwide, and in brazil the latest survey points the occurrence of 107 species. the survey also shows that approximately one quarter of them are mostly found in rocky fields, cerrados and caatingas. the purpose of this study is to summarize the genus phyllanthus in order to contribute to the completion of the monograph of the family phyllanthaceae as a whole. furthermore, this study was aimed to better circurscribe the species that occur in s？o paulo state as well as present information morphology, geographical distribution and taxonomy about the taxa studied. in the state of sao paulo 16 species of the genus were found.