Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [[crown] organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           [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 Pteridophytanaeᵀ Doweld (2001)
                     [Phylum Equisetophyta D.H.Scott (1900)] see Division Monilophyta Cantino & Donoghue
                       [Class †Calamitopsida Endl. (1841)] see Class Equisetopsida C.Agardh (1825)
                         1.0 [Order †Calamostachyales S.V.Meyen (1987)] see Order Calamitales Eichwald (1852)
                         2 Order †Calamocarpales Doweld (2001) [monotypic]