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Temporal range: Late Devonian – Present
Equisetum sylvaticum saint-michel 02 27052007 1.jpg
Equisetum sylvaticum in France
Scientific classification e
Kingdom: Plantae
Class: Polypodiopsida
Subclass: Equisetidae
Order: Equisetales
DC. ex Bercht. & J. Presl

Equisetales is an order of subclass Equisetidae with only one living family, Equisetaceae, containing the genus Equisetum (horsetails).


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.[1] The linear sequence of Christenhusz et al. (2011), intended for compatibility with the classification of Chase and Reveal (2009)[2] which placed all land plants in Equisetopsida,[3] made it the sole member of subclass Equisetidae, equivalent to Smith's Equisetopsida.[2] The placement of Equisetales in subclass Equisetidae has subsequently been followed in the classifications of Christenhusz and Chase (2014)[4] and PPG I (2016).[5]

The fossil record includes additional extinct species in Equisetaceae and the extinct families Calamitaceae, Archaeocalamitaceae and Phyllothecaceae.[6][7]


  1. ^ Smith, Alan R.; Pryer, Kathleen M.; Schuettpelz, Eric; Korall, Petra; Schneider, Harald; Wolf, Paul G. (August 2006). "A classification for extant ferns" (PDF). Taxon. 55 (3): 705–731. doi:10.2307/25065646.
  2. ^ a b Christenhusz, Maarten J. M.; Zhang, Xian-Chun; Schneider, Harald (18 February 2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa. 19: 7–54.
  3. ^ Chase, Mark W.; Reveal, James L. (October 2009). "A phylogenetic classification of the land plants to accompany APG III". Botanical Journal of the Linnean Society. 161 (2): 122–127. doi:10.1111/j.1095-8339.2009.01002.x.
  4. ^ Christenhusz, Maarten J. M.; Chase, Mark W. (13 February 2014). "Trends and concepts in fern classification". Annals of Botany. 113 (4): 571–594. doi:10.1093/aob/mct299. PMC 3936591. PMID 24532607.
  5. ^ The Pteridophyte Phylogeny Group (November 2016). "A community-derived classification for extant lycophytes and ferns". Journal of Systematics and Evolution. 54 (6): 563–603. doi:10.1111/jse.12229.
  6. ^ Stanich, Nicholas; Gar W. Rothwell; Ruth A. Stockey (2009). "Phylogenetic diversification of Equisetum (Equisetales) inferrred from Lower Cretaceous species of British Columbia, Canada". American Journal of Botany. 96 (7): 1289–1299. doi:10.3732/ajb.0800381. PMID 21628278.
  7. ^ Uma nova espécie de Phyllotheca Brongniart

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