Equisetales
Template:Short description Template:Automatic taxobox
Equisetales is an order of subclass Equisetidae with only one living family, Equisetaceae, containing the genus Equisetum (horsetails), as well as a variety of extinct groups, including the tree-like Calamitaceae.
Classification
In the molecular phylogenetic classification of Smith et al. in 2006, Equisetales, in its present circumscription, was held to be the sole member of class Equisetopsida.<ref>Template:Cite journal</ref> The linear sequence of Christenhusz et al. (2011), intended for compatibility with the classification of Chase and Reveal (2009)<ref name="Christenhusz-etal-2011">Template:Cite journal</ref> which placed all land plants in Equisetopsida,<ref>Template:Cite journal</ref> made it the sole member of subclass Equisetidae, equivalent to Smith's Equisetopsida.<ref name="Christenhusz-etal-2011" /> The placement of Equisetales in subclass Equisetidae has subsequently been followed in the classifications of Christenhusz and Chase (2014)<ref>Template:Cite journal</ref> and PPG I (2016).<ref>Template:Cite journal</ref>
The fossil record includes additional extinct species in Equisetaceae and the extinct families Calamitaceae, Archaeocalamitaceae and Phyllothecaceae.<ref>Template:Cite journal</ref><ref>Uma nova espécie de Phyllotheca Brongniart</ref>
Cladogram after Elgorriaga et al, 2018.<ref>Template:Cite journal</ref>