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Organism
  Plantae
      Pteridophyta
            Polypodiopsida
                    Polypodiales
                            Osmundaceae
                                     Osmunda
                                             Osmunda cicutaria
                                             Osmunda cinnamomea
                                             Osmunda palustris
                                             Osmunda regalis
                                               Osmunda regalis subsp. palustris
                                               Osmunda regalis var. spectabilis
                                             Osmunda spectabilis
                                                   [Osmunda regalis var. palustris]
                                             Osmunda virginiana