DRESSLER (1993)
Subfamily Apostasioideae.
Subfamily Cypripedioideae.
Subfamily Epidendroideae is the largest group. It contains the tribes:
Subfamily Orchidoideae is almost exclusively terrestrial species. The tribes in this subfamily include
Subfamily Spiranthoideae is also mainly terrestrial, it has the tribes
Uncertain affinity: A group without real ties to each other, nor to any recognised group in particular. However, the Pogoniinae and the Collabiinae (both given on that page) are a recognised group.