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  Plantae
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     Streptophyta
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            Magnoliopsida
                  Ceratophyllanae
                    Ceratophyllales
                            Ceratophyllaceae
                                     Ceratophyllum
                                             Ceratophyllum australe
                                             Ceratophyllum cristatum
                                             Ceratophyllum demersum
                                                   [Ceratophyllum apiculatum]
                                             Ceratophyllum echinatum
                                                   [Ceratophyllum demersum var. echinatum]
                                                   [Ceratophyllum submersum var. echinatum]
                                             Ceratophyllum floridanum
                                             Ceratophyllum llerenae
                                             Ceratophyllum muricatum
                                               Ceratophyllum muricatum ssp. australe
                                                     [Ceratophyllum demersum var. cristatum]
                                             Ceratophyllum submersum