Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Pteridophytanae Doweld (2001) [monotypic] see Superphylum Pteridophytanae Doweld (2001)
       Division Monilophyta Cantino & Donoghue
         Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
           Order Equisetales DC. ex Bercht. & J.Presl (1829)
             01 Family †Autophyllitaceae Nakai (1943) [monotypic]
             02 Family †Asterocalamitaceae Hirmer (1927) [monotypic]
             03 Family †Calamostachyaceae S.V.Meyen (1978), nom. cons. prop.
             04 Family †Gondwanostachyaceae S.V.Meyen (1983), nom. cons. prop.
             05 Family †Tchernoviaceae S.V.Meyen (1983)
             06 Family †Manchurostachyaceae Grauvogel-Stamm (1978) [monotypic]
             07 Family †Konnostachyaceae Doweld (2001) [monotypic]
             08 Family †Notocalamitaceae Rigby (1972) [monotypic]
             09 Family †Echinostachyaceae Grauvogel-Stamm (1978), nom. cons. prop. [monotypic]
             10 Family Equisetaceae Michx. ex DC. (1804) - horsetails