Do both Butea and Calanthe have just two species?
Butea: Butea is a genus of flowering plants belonging to the pea family, Fabaceae. Butea:  It is sometimes considered to have only two species, "B. monosperma" and "B. superba", or is expanded to include four or five species. Calanthe:  in horticulture – is a widespread genus of terrestrial orchids (family Orchidaceae) with some 200 species.
no