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 Hamamelidae see Subclass Hamamelididae Takht. (1967)
               Order Fagales Engl. (1892)
                 Family Betulaceae Gray (1822), nom. cons. - birch family
                   1 Genus Alnus Mill. (1754)
                   2 Genus Betula L. (1753) - birches
                   3 Genus Carpinus L. (1753)
                   4 Genus Ostrya Scopoli (1760), nom. cons.
                   5 Genus Corylus L. (1753)