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Eukaryota
  Plantae
    Embryophyta
      Magnoliophyta
            Monocots
                    Alismatales
                            Hydrocharitaceae
                                     Egeria
                                     Elodea
                                             Elodea canadensis
                                             Elodea densa
                                                   [Egeria densa]
                                     Halophila
                                             Halophila ovalis
                                               Halophila ovalis subsp. ovalis
                                     Hydrilla
                                             Hydrilla verticillata
                                     Hydrocharis
                                             Hydrocharis morsus-ranae
                                     Lagarosiphon
                                             Lagarosiphon cordofanus
                                                   [Lagarosiphon crispus]
                                                   [Lagarosiphon tsotsorogensis]
                                             Lagarosiphon ilicifolius
                                             Lagarosiphon major
                                                   [Lagarosiphon muscoides var. major]
                                             Lagarosiphon muscoides
                                             Lagarosiphon verticillifolius
                                     Najas
                                             Najas graminea
                                               Najas graminea var. graminea
                                             Najas horrida
                                             Najas marina
                                               Najas marina subsp. armata
                                                     [Najas marina subsp. delilei]
                                                     [Najas marina subsp. muricata]
                                             Najas setacea
                                     Ottelia
                                             Ottelia exserta
                                             Ottelia kunenensis
                                             Ottelia muricata
                                             Ottelia ulvifolia
                                                   [Ottelia australis]
                                                   [Ottelia vernayi]
                                     Vallisneria
                                             Vallisneria spiralis
                                                   [Vallisneria aethiopica]