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.
Calamagrostis varia Calamagrostis varia is a species of flowering plant from the Poaceae family which is native to Europe.