"Handroanthus" was established by Joáo Rodrigues de Mattos in 1970. Gentry did not agree with the segregation of "Handroanthus" from "Tabebuia" and warned against "succumbing to further paroxysms of unwarranted splitting". In 1992, Gentry published a revision of "Tabebuia" in Flora Neotropica, in which he described 99 species and 1 hybrid, including those species placed by some authors in "Roseodendron" or "Handroanthus". Gentry divided "Tabebuia" into 10 "species groups", some of them intentionally artificial. "Tabebuia", as currently circumscribed, consists of groups 2,6,7,8,9, and 10. Group 1 is now the genus "Roseodendron". Groups 3,4, and 5 compose the genus "Handroanthus".