The present study includes all of the known Trigoniaceae, both neotropical and paleotropical. Although the family is primarily neotropical, it is represented by two monotypic genera found in Malaysia (Trigoniastrum) and Madagascar (Humbertodendron). The neotropical genus, Trigonia is represented by 24 species of treelets, shrubs, or scandent shrubs, and ranges from the southernmost portion of Mexico to the south of Brazil and eastern Paraguay.