living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Embryobionta Cronquist, Takht. & W.Zimm.
         Division Magnoliophyta Cronquist, Takht. & Zimmerm. (1966) see Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996)
           Class Magnoliopsida Brongn. (1843)
             Subclass Rosidae Takht. (1967) see Superorder Rosanae Takht. (1967)
               Order Rhamnales Dumort. (1829) see Order Rosales Bercht. & J.Presl (1820)
                 Family Rhamnaceae Juss. (1789), nom. cons. - buckthorn family
                   1 Genus Karwinskia Zucc. (1832)
                   2 Genus Rhamnus L. (1753)
                   3 Genus Phylica L. (1753)
                   4 Genus Zizyphus Adans. (1763), orth. inval. see Genus Ziziphus Mill. (1754)
                   5 Genus Gouania Jacq. (1763)
                   6 Genus Ceanothus L. (1753)