Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Liliopsida Batsch (1802) see Class Magnoliopsida Brongn. (1843)
     Subclass Liliidae J.H.Schaffn. (1911) see Order Liliales Perleb (1826)
       Superorder Lilianae Takht. (1967) - monocots
         Order Melanthiales R.Dahlgren ex Reveal (1992) see Order Liliales Perleb (1826)
           Family Tofieldiaceae Takht. (1995)
             1 Genus Tofieldia Huds. (1778)
             2 Genus Pleea Michx. (1803)
             3 Genus Triantha see Genus Tofieldia Huds. (1778)
             4 Genus Isidrogalvia
             5 Genus Harperocallis McDaniel (1968)