The leaves of this subtribe are conduplicate and leathery. There are about 1,800 species in 100 to 130 genera in this tribe. Species are either terrestrial or epiphytic and range throughout global tropical regions. They are unique in that all members have a sympodial growth habit and have two pollinia. There are over 400 species in this subtribe.
Species are usually terrestrial and can be found in Asia, Africa, and tropical America.
There are less than 50 species in this subtribe. There are less than 50 species in this subtribe. There are less than 50 species in this subtribe. There are about 150 species in this subtribe and are epiphytes found in the Western Hemisphere. There are about 200 species in this subtribe and are epiphytes found in the Western Hemisphere.