Sweetia fruticosa is a species of flowering plants in the legume family, Fabaceae. It is a tree native to eastern, southern, and west-central Brazil, Bolivia, Paraguay, and northeastern Argentina. It is the only member of the genus Sweetia (though some sources also include Sweetia atrata <small>Mohlenbr.</small>). It belongs to the subfamily Faboideae. It was traditionally assigned to the tribe Sophoreae, mainly on the basis of flower morphology; recent molecular phylogenetic analyses assigned Sweetia fruticosa into an informal, monophyletic clade called the "vataireoids".