Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Biota
           "neomura"
             Domain Eukaryota Chatton, 1925 - eukaryotes
               neokaryotes Cavalier-Smith 1993 - mitochondrial eukaryotes
                 neozoa Cavalier-Smith 1993
                   Superkingdom Corticata Lankester, 1878
                     Kingdom Plantae Haeckel (1866) - plants
                       Subkingdom Viridiplantae Caval.-Sm. (1981) - green plants
                         Infrakingdom Streptophyta C. Jeffrey (1967)
                           Superphylum Embryophyta
                             "polysporangiophytes"
                               Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998) - vascular plants
                                 [Subphylum] Euphyllophytina
                                   [Infraphylum] "Moniliformopses" Kenrick & Crane, 1997, nom. inval. - monilophytes
                                     Class Equisetopsida C. Agardh (1825) - horsetails
                                       1 Order †Pseudoborniales
                                       2 Order †Bowmanitales - sphenophylls
                                       2 Order †Sphenophyllales
                                       3.1 Order †Calamitales
                                       3.2 Order Equisetalesᵀ Dumortier (1829)