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  Plantae
      Charophyta
        Streptophytina
            Equisetopsida
              Magnoliidae
                    Ceratophyllales
                            Ceratophyllaceae
                                     Ceratophyllum
                                             Ceratophyllum demersum
                                                   [Ceratophyllum apiculatum]
                                               Ceratophyllum demersum var. apiculatum
                                               Ceratophyllum demersum var. cristatum
                                               Ceratophyllum demersum var. echinatum
                                             Ceratophyllum echinatum
                                             Ceratophyllum muricatum
                                               Ceratophyllum muricatum ssp. australe
                                                     [Ceratophyllum australe]
                                                     [Ceratophyllum cristatum]
                                                     [Ceratophyllum floridanum]
                                                     [Ceratophyllum llerenae]
                                             Ceratophyllum submersum
                                               Ceratophyllum submersum var. echinatum
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