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
             1 Subfamily Helminthostachyoideae C.Presl [monotypic]
             2 Subfamily Mankyuoideae J. R. Grant & B. Dauphin [monotypic]
             3 Subfamily Ophioglossoideae C.Presl
             4 Subfamily Botrychioideae C.Presl