Do both Butea and Calanthe have just two species?
Butea Butea is a genus of flowering plants belonging to the pea family, Fabaceae. It is sometimes considered to have only two species, "B. monosperma" and "B. superba", or is expanded to include four or five species.
Drymoea Drymoea is a genus of moths in the family Geometridae. This genus was originally proposed in the Arctiidae, but was later transferred to the Geometridae. Some other genera ("Sangala", "Melanoptilon", "Nelo", "Nelopsis") was then included in this genus. The genus is confined to the Neotropical ecozone.