vascular plants see Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998)
   euphyllophytes see Clade Euphyllophyta Lecointre & Le Guyader 2006 [Cantino & Donoghue 2020]
     monilophytes - ferns see Clade Monilophyta Cantino & Donoghue 2007 [Doyle, Cantino & Donoghue 2020]
       Class Psilotopsida D.H.Scott (1909) see Subclass Ophioglossidae Klinge (1882)
         Order Ophioglossales Link (1833)
           Family Ophioglossaceae Martinov (1820) - ophioglossoids
             1 Genus Botrychium Sw. (1801) - grapeferns
             2 Genus Helminthostachys Kaulf. (1824)
             3 Genus Mankyua B.Y.Sun, M.H.Kim & C.H.Kim (2002)
             4 Genus Ophioglossum L. (1753) - adder tongues