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Organism
  Plantae
      Tracheophyta
            Polypodiopsida
                    Salviniales
                            Salviniaceae
                                     Azolla
                                             Azolla caroliniana
                                                   [Azolla cristata]
                                             Azolla filiculoides
                                               Azolla filiculoides subsp. cristata
                                                     [Azolla cristata]
                                             Azolla microphylla
                                                   [Azolla mexicana]
                                             Azolla pinnata
                                     Salvinia
                                             Salvinia auriculata
                                                   [Salvinia rotundifolia]
                                             Salvinia minima
                                                   [Salvinia rotundifolia]
                                             Salvinia molesta
                                             Salvinia natans
                                             Salvinia oblongifolia