Caularthron
Caularthron Constantine [Samuel Rafinesque|Raf.], abbreviated Cau. in the horticultural trade, is a genus of orchids with 4 species. They are epiphytic orchids with specialized hollow pseudobulbs that house ants. The genus is exclusively found in the tropical regions of southern Mexico, Central America, the West Indies, and northern South America.
List of species
Species accepted as of May 2014:| Image | Name | Distribution | Elevation |
| Caularthron amazonicum H.G.Jones | Trinidad, Venezuela, Brazil | ||
| Caularthron bicornutum Raf. 2n = 40, n = 20. | Trinidad-Tobago, Venezuela, Brazil, Suriname, Guyana, Colombia | ||
| Caularthron bilamellatum R.E.Schult. | Belize, Central America, northern South America, Trinidad, Chiapas | 0 - 700 | |
| Caularthron kraenzlinianum H.G.Jones | Windward Islands |