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Organism
  Plantae
      Tracheophyta
            Magnoliopsida
                    Ceratophyllales
                            Ceratophyllaceae
                                     Ceratophyllum
                                             Ceratophyllum demersum
                                                   [Ceratophyllum apiculatum]
                                               Ceratophyllum demersum var. apiculatum
                                                     [Ceratophyllum apiculatum]
                                             Ceratophyllum echinatum
                                                   [Ceratophyllum demersum var. echinatum]
                                                   [Ceratophyllum submersum var. echinatum]
                                             Ceratophyllum muricatum
                                               Ceratophyllum muricatum subsp. australe
                                                     [Ceratophyllum australe]
                                                     [Ceratophyllum cristatum]
                                                     [Ceratophyllum demersum var. cristatum]
                                                     [Ceratophyllum floridanum]
                                                     [Ceratophyllum llerenae]
                                                     [Ceratophyllum submersum subsp. muricatum]
                                               Ceratophyllum muricatum subsp. muricatum
                                                     [Ceratophyllum submersum subsp. muricatum]
                                             Ceratophyllum submersum