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 Pteridophyta Schimp. (1879) see Phylum Filicinophyta
             Class Marsileopsida Trevis. (1877) see Order Salviniales Link (1833)
               Subclass Salviniidae Reveal (1996) see Order Salviniales Link (1833)
                 Order Salviniales Link (1833) - water ferns
                   1 Family Salviniaceae Martinov (1820) - floating ferns
                   2 Family Azollaceae Wettst. (1903) see Family Salviniaceae Martinov (1820)