Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["Vegetabile Regnum" nom. inval. - plant kingdom] see Kingdom Plantae Haeckel (1866)
           ["Publicae"]
             ["Diclinia"]
               [Class "Monoecia" L. (1735), nom. inval.] see Class Monoecia L. (1753), nom. inval.
                 [Order "Monoecia Tetrandria" L. (1735), nom. inval.] see Order Monoecia Tetrandria L. (1753), nom. inval.
                   [Genus "Alnus" nom. inval.]