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)
               Order †Sphenophyllales Wettst. (1903)
                 Family †Aspidostachyaceae Doweld (2001) [monotypic]
                   Genus †Aspidostachys W.Remy (1955)