Natura - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Vegetabile Regnum nom. inval. - plant kingdom see Kingdom Plantae Haeckel (1866)
         Publicae
           Diclinia
             Class Dioecia L. (1735), nom. inval. see Class Dioecia L. (1753), nom. inval.
               Order Dioecia Octandria L. (1735), nom. inval. see Order Dioecia Octandria L. (1753), nom. inval.
                 Genus Populus nom. inval. see Genus Populus L. (1753)