Recent molecular phylogenetic analyses in the plant family Onagraceae support the need for revisions in the family classification. In Revised Classification of the Onagraceae, the authors briefly survey the history of generic and suprageneric classification in Onagraceae, summarize our knowledge of the morphological and molecular variation in the family in a phylogenetic context, and propose a revised classification that reflects that phylogeny. A species level synopsis of the family is included, incorporating all nomenclatural changes and combinations but not full species-level synonymy. The authors provide descriptions of all taxa recognized for the first time, as well as tribes, genera, sections, subsections, and series.