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The Orchidales used to be divided into the following families:
- Thismiaceae : is now considered a sister to and included in the family Burmanniaceae, which belongs to another order Dioscoreales.
- Orchidaceae - The orchid family is subdivided in several several subfamilies, and then in tribes, subtribes, alliances and then genera. The following six subfamilies are recognized :
- Subfamily Spiranthoideae : (derived from Orchidoidea)
- Subfamily Orchidoideae : considered paraphyletic; most orchids (750 genera)
- Subfamily Epidendroideae : includes almost 80 % of the species; monophyletic
- Subfamily Vandoideae : monophyletic
- Subfamily Apostasioideae : monophyletic (Apostasia and Neuwiedia)
- Subfamily Cypripedioideae : monophyletic; lady's slippers (4 genera)
- Subfamily Vanniloideae, sometimes recognized as a distinct subfamily. But, from a molecular point of view, it is rather a sister to subfamily Epidendroideae + subfamily Orchidoideae. This subfamily is a branch at the basal dichotomy of the monandrous orchids.
The order Orchidales is no longer in use. According to the Update of the Angiosperm Phylogeny Group [1] (http://en.wikipedia.org/wiki/Wikipedia_Tree_of_Life/Update_of_the_Angiosperm_Phylogeny_Group), it is now part of the order Asparagales.
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