What is "ephippianthus"

Ephippianthus is a genus of flowering plants from the orchid family, Orchidaceae. It contains two known species, native to northeastern Asia.

• Ephippianthus sachalinensis Rchb.f. in F.K.Schmidt - Japan, Russian Far East ( Sakhalin, Kuril Islands, Sakhalin, Khabarovsk)
• Ephippianthus sawadanus (Maek.) Ohwi - Honshu