Monotypic orchid genera

Eriaxis is a monotypic genus of orchids in the subfamily Vanilloideae. The sole species is Eriaxis rigida, endemic to New Caledonia. Its closest relative is Clematepistephium, also endemic to New Caledonia.

Clematepistephium is a monotypic genus of orchids containing only one known species, Clematepistephium smilacifolium, endemic to the island of New Caledonia. Its closest relative is Eriaxis, also endemic to New Caledonia.

Dossinia is a monotypic genus of orchids containing only the species Dossinia marmorata. It is endemic to Borneo.

Mexipedium is a monotypic genus of the orchid family Orchidaceae, subfamily Cypripedioideae, consisting of only one species, Mexipedium xerophyticum. It is also the sole genus of tribe Mexipedieae and subtribe Mexipediinae.

Archivea is a monotypic genus of orchids containing only the species Archivea kewensis. Known only from an 1823 watercolour illustration, it was described in 1996 by botanists Eric A. Christenson and Rudolf Jenny. It is believed to be native to Brazil, however, it has yet to be documented beyond the original 1823 illustration.