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 Ophioglossophyta Doweld (2001)
             Subphylum Ophioglossophytina Doweld (2001) [monotypic]
               Class Ophioglossopsida Thomé (1874) [monotypic] see Order Ophioglossales Link (1833)
                 Order Ophioglossales Link (1833)
                   Family Helminthostachyaceae Ching (1941) see Family Ophioglossaceae Martinov (1820)