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This is a list of genera in the orchid family (Orchidaceae), originally according to The Families of Flowering Plants - L. Watson and M. J. Dallwitz. This list is adapted regularly with the changes published in the Orchid Research Newsletter which is published twice a year by the Royal Botanic Gardens, Kew. The most up to date list of accepted; genera, natural nothogenera, species and natural nothospecies with their synonyms can be found on the World Checklist of Selected Plants Families Search Page published by the Royal Botanic Gardens, Kew. This list is reflected on Wikispecies Orchidaceae and the new eMonocot website Orchidaceae Juss.
This taxonomy undergoes constant change, mainly through evidence from DNA study. Orchids were traditionally defined by morphological similarity (structure of their flowers and other parts). However, recent changes to nomenclature have been driven primarily by DNA studies and also by re-examination of herbarium specimens. This has led to a reduction of genera and species as well as re-circumscription of subfamilies, tribes and subtribes. Orchid taxonomy is still being revised and each year about another 150 new species are being discovered. The list of genera alone currently stands just short of 1000 entries.
From a cladistic point of view, the orchid family is considered to be monophyletic, i.e. the group incorporates all the taxa derived from an ancestral group.
The taxonomy of the orchids is explained on the page Taxonomy of the orchid family.
There are five recognized subfamilies: [1]
The taxonomy of the Orchidaceae has evolved slowly during the last 250 years, starting with Carl Linnaeus who in 1753 recognized eight genera. De Jussieu recognized the Orchidaceae as a separate family in his Genera Plantarum in 1789. Olof Swartz recognized 25 genera in 1800. Louis Claude Richard provided us in 1817 with the descriptive terminology of the orchids.. The next step was taken in 1830-1840 by John Lindley, who recognized four subfamilies. He is generally recognized as the father of orchid taxonomy. The next important step was taken by George Bentham with a new classification, recognizing subtribes for the first time. This classification was first presented in a paper that Bentham read to the Royal Society in 1881. Then it was published in 1883 in the final volume of Genera Plantarum. The next great contributors were Pfitzer (1887), Schlechter (1926), Mansfeld (1937), Dressler and Dodson (1960), Garay, Vermeulen (1966), again Dressler (1981). and Burns-Balogh and Funk (1986). Dressler's 1993 book had considerable influence on later work.
Epidendrum, abbreviated Epi in the horticultural trade, is a large neotropical genus of the orchid family. With more than 1,500 species, some authors describe it as a mega-genus. The genus name refers to its epiphytic growth habit.
Laeliinae is a Neotropical subtribe including 40 orchid genera, such as Brassavola, Laelia and Cattleya. The genus Epidendrum is the largest within this subtribe, containing about 1500 species. This is followed by the genus Encyclia, with over 120 species.
Brachystele is a genus of flowering plants from the orchid family, Orchidaceae. It consists of 20 species native primarily to South America but with a few species in Mexico, Central America, and Trinidad & Tobago.
Ceratandra is a genus of flowering plants from the orchid family, Orchidaceae. It contains 6 known species, all endemic to South Africa.
Chondrorhyncha is a genus of flowering plants from the orchid family, Orchidaceae. At the present time 7 species are recognized, though many more names have been proposed. All species are native to Colombia, Venezuela and Ecuador.
Cleisomeria is a genus of flowering plants from the orchid family, Orchidaceae. There are two known species, native to southeast Asia from Bangladesh to Borneo
Crossoglossa is a genus of flowering plants from the orchid family, Orchidaceae. It contains 26 currently recognized species native to Central America and South America, from Nicaragua to Bolivia.
Diplocentrum is a genus of flowering plants from the orchid family, Orchidaceae. It has two known species:
Diplomeris is a genus of flowering plants from the orchid family, Orchidaceae. It is native to China, the Indian subcontinent, and southeast Asia. Three species are currently recognized :
Epistephium is a genus of flowering plants from the orchid family, Orchidaceae. It is native to South America, with a few species in Belize and Trinidad.
Euryblema is a genus of flowering plants from the orchid family, Orchidaceae. It contains two known species, native to Panama and Colombia.
Triphora is a genus of flowering plants from the orchid family, Orchidaceae. It is native to South America, Central America, southern Mexico, the West Indies and eastern North America as far north as Ontario. Noddingcaps is a common name for plants in this genus.
Helleriella is a genus of flowering plants from the orchid family, Orchidaceae. It contains two known species, native to Mexico and Central America.
Homalopetalum is a genus of flowering plants from the orchid family, Orchidaceae. It contains 8 known species native to Central America, northern South America, Mexico and the West Indies.
Ixyophora is a genus of flowering plants from the orchid family, Orchidaceae. It has 5 known species, all native to South America.
Polystachya neobenthamia is a species of flowering plants from the orchid family, Orchidaceae. It is terrestrial, lithophilic and grows among leaf litter and other detritus on rock faces. It is endemic to Tanzania.
Oreorchis is a genus of flowering plants from the orchid family, Orchidaceae. It is native to Asia. Species currently accepted as of June 2014:
Schiedeella is a genus of flowering plants from the orchid family, Orchidaceae. It is native to the Western Hemisphere: Mexico, the West Indies and Central America, with one species (S. arizonica) in the southwestern United States.
The Eriinae form a subtribe of Podochileae, a tribe of the orchid family (Orchidaceae). The name is derived from the genus Eria.