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Organism
  Plantae
            Magnoliopsida
                    Rosales
                            Ulmaceae
                                     Planera
                                             Planera aquatica
                                     Ulmus
                                             Ulmus alata
                                             Ulmus americana
                                                   [Ulmus americana var. floridana]
                                                   [Ulmus floridana]
                                               Ulmus americana var. americana
                                             Ulmus crassifolia
                                             Ulmus parvifolia
                                             Ulmus pumila
                                             Ulmus rubra