Phylum [Tracheophyta] Sinnott ex Caval.-Sm. (1998) - vascular plants
   Subphylum Polypodiophytina Reveal (1996) [monotypic]
     Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966) - ferns
       Subclass Ophioglossidae Klinge (1882)
         Order Ophioglossales Link (1833) [monotypic]
           Family Ophioglossaceae Martinov (1820) - ophioglossoids
             Subfamily Ophioglossoideae C.Presl
               1 Genus Cheiroglossa C.Presl
               2 Genus Ophioderma (Blume) Endl. (1836)
               3 Genus Ophioglossum L. (1753) - adder tongues
               4 Genus Rhizoglossum C.Presl