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.
Calanthe fargesii Calanthe fargesii is a species of plant in the Orchidaceae family. It is endemic to China (Chongqing, Gansu, Guizhou, and Sichuan provinces). Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests.