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 Psilotopsida D.H.Scott (1909) see Subclass Ophioglossidae Klinge (1882)
           Order Ophioglossales Link (1833) [monotypic]
             Family Ophioglossaceae Martinov (1820) - ophioglossoids
               1 Genus Cheiroglossa C.Presl
               2 Genus Botrychium Sw. (1801) - grapeferns
               3 Genus Helminthostachys Kaulf. (1824)
               4 Genus Mankyua B.Y.Sun, M.H.Kim & C.H.Kim (2002)
               5 Genus Ophioglossum L. (1753) - adder tongues