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According to the most recent classification scheme, the APG III of 2009, the order includes five families: Commelinaceae, Haemodoraceae, Hanguanaceae, Philydraceae, and Pontederiaceae.
This is unchanged from the APG II of 2003, but different from the older APG system of 1998, which did not include Hanguanaceae.
The still older Cronquist system of 1981, which was not based on molecular data, placed the order in subclass Commelinidae of class Liliopsida and included the families Commelinaceae, Mayacaceae, Rapateaceae and Xyridaceae.
These families are now known to be only distantly related.

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