Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["Vegetabile Regnum" nom. inval. - plant kingdom] see Kingdom Plantae Haeckel (1866)
           ["Publicae"]
             ["Monoclinia"]
               ["Diffinitas"]
                 ["Indifferentismus"]
                   [Class "Polyandria" L. (1735), nom. inval.] see Class Polyandria L. (1753), nom. inval.
                     [Order "Polyandria Monogynia" L. (1735), nom. inval.] see Order Polyandria Monogynia L. (1753), nom. inval.
                       ["Calice Tabescente"]
                         1.1 [Genus "Cereus" nom. inval.] see Genus Cactus nom. inval.
                         1.2 [Genus "Opuntia" Tourn., nom. inval.] see Genus Cactus nom. inval.
                         1.2.0 [Genus "Tuna" J.J. Dillenius, nom. inval.] see Genus Cactus nom. inval.
                         1.3.0 [Genus "Melocactus" Tourn., nom. inval.] see Genus Cactus nom. inval.
                         2 [Genus "Euphorbium" nom. inval.] see Genus Euphorbia nom. inval.