Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
       Subkingdom Pteridobiotina Britton & A. Br. (1896)
         Superphylum Pteridophytanae Doweld (2001)
           Phylum Equisetophyta D.H.Scott (1900) see Division Monilophyta Cantino & Donoghue
             Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
               Order Equisetales DC. ex Bercht. & J.Presl (1829) [monotypic]
                 1 Family Equisetaceae Michx. ex DC. (1804) - horsetails