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 †Sphenophyllophyta D.H.Scott (1900) [monotypic] see Division Monilophyta Cantino & Donoghue
             Class †Sphenophyllopsida Engl. (1892)
               1 Order †Iridopteridales W.E.Stein (1982) [monotypic] see Order Cladoxylales W.Zimm. (1930)
               2 Order †Pseudoborniales E.W.Berry (1920) [monotypic]
               3 Order †Cheirostrobales Zimmerm. (1930) [monotypic] see Order Sphenophyllales Wettst. (1903)
               4 Order †Sphenophyllales Wettst. (1903)