Taxonomy
The taxonomy of this family is in constant flux, as new studies continue to identify more classificatory elements. The Orchidaceae is currently placed in the order Asparagales by the APG III system of 2009.
Five subfamilies are recognised. The cladogram has been made according to the APG system:
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Apostasioideae: 2 genera and 16 species, south-western Asia
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Cypripedioideae: 5 genera and 130 species, from the temperate regions of the world, as well as tropical America and tropical Asia
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Vanilloideae: 15 genera and 180 species, humid tropical and subtropical regions, eastern North America
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Epidendroideae: more than 500 genera and more or less 20,000 species, cosmopolitan
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Orchidoideae: 208 genera and 3,630 species, cosmopolitan
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