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 Poeae R.Br. (1814)
                 01 Genus Poa L. (1753)
                 02 Genus Agrostis L. (1753)
                 03 Genus Aira L. (1753)
                 04 Genus Anthoxanthum L. (1753)
                 05 Genus Arrhenatherum P.Beauv. (1812)
                 06 Genus Avena L. (1753) - oats
                 07 Genus Briza L. (1753)
                 08 Genus Calamagrostis Adans. (1763)
                 09 Genus Catabrosa P.Beauv. (1812)
                 10 Genus Cinna L. (1753)
                 11 Genus Colpodium Trinius (1822)
                 12 Genus Cutandia Willkomm (1860)
                 13 Genus Cynosurus L. (1753)
                 14 Genus Dactylis L. (1753)
                 15 Genus Deschampsia P.Beauv. (1812)
                 16 Genus Eremopoa Roshevitz, in Komarov (1934)
                 17 Genus Festuca L. (1753)
                 18 Genus Helictotrichon Besser, in Schult. & J.H. Schultes (1827)
                 19 Genus Hierochloe R.Br. (1810)
                 20 Genus Holcus L. (1753)
                 21 Genus Koeleria Pers. (1805)
                 22 Genus Lolium L. (1753)
                 23 Genus Milium L. (1753)
                 24 Genus Polypogon Desf. (1798)
                 25 Genus Puccinellia Parl. (1848)
                 26 Genus Trisetum Pers. (1805)
                 27 Genus Vulpia C.C.Gmel. (1805)