Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Liliopsida Batsch (1802) see Class Magnoliopsida Brongn. (1843)
     Subclass Commelinidae Takht. (1967) see Order Commelinales Mirb. ex Bercht. & J.Presl (1820)
       Superorder Poanae Takht. (1997), nom. inval. see Superorder Poanae Takht. ex Reveal & Doweld (1999)
         Order Poales Burnett (1835) - grasses
           Family Poaceae Barnhart (1895), nom. cons. - grass family
             Subfamily Pooideae
               Tribe Stipeae
                 1 Genus Oryzopsis Michx. (1803)
                 2 Genus Piptatherum
                 3 Genus Stipa L. (1753)