Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Caryophyllidae Takht. (1967) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820)
       Superorder Polygonanae Takht. ex Reveal (1992) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820)
         Order Polygonales Dumort. (1829) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820)
           Family Polygonaceae Juss. (1789), nom. cons. - buckwheat family
             Subfamily Polygonoideae Eaton
               Tribe Rumicieae see Tribe Rumiceae
                 1 Genus Rheum L. (1753)
                 2 Genus Rumex L. (1753)
                 3 Genus Oxyria J. Hill (1765)
                 4 Genus Emex Campdera (1819), nom. cons.