Do both Butea and Calanthe have just two species?
Calanthe Calanthe – commonly abbreviated Cal. in horticulture – is a widespread genus of terrestrial orchids (family Orchidaceae) with some 200 species.
Sanderella Sanderella is a genus of flowering plants from the orchid family, Orchidaceae, native to South America. Two species are recognized at present (June 2014):