Hydatellales

Hydatellales is a botanical name for an order of flowering plants. In the Cronquist system, 1981, the name was used for an order placed in the subclass Commelinidae in class Liliopsida [=monocotyledons]. The order consisted of one family only:

Similarly the Dahlgren system recognised this order (with the same circumscription and placed it in superorder Commelinanae in subclass Liliidae [=monocotyledons].

The APG II system assigns these plants to the order Poales, close to the grasses and sedges. Recent study by Saarela et al.,[1] however, suggests a position out of the Poales; here, the Hydatellaceae link with the waterlilies, the first time a plant has been ejected from the monocots. The Angiosperm Phylogeny Website [2] had since updated the Nymphaeales page to include the family.

References
  1. Saarela, Jeffery M., Hardeep S. Rai, James A. Doyle, Peter K. Endress, Sarah Mathews, Adam D. Marchant, Barbara G. Briggs & Sean W. Graham. 2007. Hydatellaceae identified as a new branch near the base of the angiosperm phylogenetic tree. Nature 446:312-315.
  2. Stevens, P. F. (2001 onwards). Nymphaeales. Angiosperm Phylogeny Website. Version 7, May 2006. Accessed 21 March 2007.
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