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