Flacourtiaceae is a defunct family of flowering plants whose former members have been scattered to various other families, mostly to Achariaceae, Samydaceae, and Salicaceae. It was so vaguely defined that hardly anything seemed out of place there and it became a dumping ground for odd and anomalous genera, gradually making the family even more heterogeneous. In 1975, Hermann Sleumer said "Flacourtiaceae as a family is a fiction; only the tribes are homogeneous."
In Cronquist's classification, it included 89 genera and more than 800 living species. Of these, many, including the type genus Flacourtia, have now been transferred to the Salicaceae in the molecular phylogeny-based classification, known as the APG II system, established by the Angiosperm Phylogeny Group. In the list below, Salicaceae is defined broadly. Some taxonomists would divide it into Salicaceae sensu stricto, Scyphostegiaceae, and Samydaceae.