Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Pteridophytanae Doweld (2001) [monotypic] see Superphylum Pteridophytanae Doweld (2001)
       Division Monilophyta Cantino & Donoghue
         Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966) - ferns
           Order Salviniales Link (1833) - water ferns
             1 Family †Hydropteridiaceae Doweld (2001)
             2 Family †Heroleandraceae Krassilov & Golovn. (2000) [monotypic]
             3 Family Marsileaceae Mirb. (1802) - clover ferns
             4 Family Salviniaceae Martinov (1820) - floating ferns