Gretheria

Gretheria is a genus of flowering plants in the legume family, Fabaceae. It includes two species of trees native to tropical and subtropical North America, ranging from northern Mexico to Costa Rica.
 * Gretheria campylacantha (L.Rico & M.Sousa) Duno & Torke – southwestern Mexico and Honduras, Nicaragua, and Costa Rica
 * Gretheria sonorae (S.Watson) Duno & Torke – northern Mexico