Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Vegetabile L. (1735), nom. inval. - plant kingdom see Kingdom Plantae Haeckel (1866)
         Publicæ
           Monoclinia
             Diffinitas
               Indifferentismus
                 Class Icosandria L. (1735), nom. inval. see Class Icosandria L. (1753), nom. inval.
                   Order Icosandria Digynia L. (1735), nom. inval. see Order Icosandria Digynia L. (1753), nom. inval.
                     1 Genus Ribes nom. inval. see Genus Ribes L. (1753)
                     1.0 Genus Grossularia Tourn., nom. inval. see Genus Ribes nom. inval.
                     2 Genus Crataegus Tourn., nom. inval. see Genus Crataegus L. (1753)
                     2.0 Genus Oxyacantha H.B. Ruppius, nom. inval. see Genus Crataegus Tourn., nom. inval.