organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Viridaeplantae Cavalier-Sm. (1981) - green plants see [unranked] Viridiplantae Cavalier-Smith, 1981
         Land plants
           Phylum Sphenophyta see Infraphylum Sphenophytae (auct.) Cavalier-Sm. (1998)
             Order Equisetales DC. ex Bercht. & J.Presl (1829)
               1 Family †Calamitaceae Unger (1840) see Family Calamostachyaceae S.V.Meyen (1978), nom. cons. prop.
               2 Family †Tchernoviaceae S.V.Meyen (1983)
               3 Family †Gondwanostachyaceae S.V.Meyen (1983), nom. cons. prop.
               4 Family Equisetaceae Michx. ex DC. (1804) - horsetails