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  Plantae
    Viridiplantae
     Streptophyta
     Embryophyta
      Tracheophyta
        Spermatophytina
            Magnoliopsida
                  Lilianae
                         [Monocotyledoneae]
                    Alismatales
                           [Aponogetonales]
                           [Arales]
                           [Butomales]
                           [Cymodoceales]
                           [Elodeales]
                           [Hydrocharitales]
                           [Juncaginales]
                           [Lemnales]
                           [Najadales]
                           [Orontiales]
                           [Pistiales]
                           [Posidoniales]
                           [Potamogetonales]
                           [Ruppiales]
                           [Scheuchzeriales]
                           [Tofieldiales]
                           [Vallisneriales]
                           [Zosterales]
                            Tofieldiaceae
                                     Harperocallis
                                             Harperocallis flava
                                     Pleea
                                             Pleea tenuifolia
                                                   [Tofieldia tenuifolia]
                                     Tofieldia
                                             Tofieldia coccinea
                                             Tofieldia glabra
                                             Tofieldia occidentalis
                                             Tofieldia pusilla
                                                   [Narthecium pusillum]
                                                   [Tofieldia palustris]
                                     Triantha
                                             Triantha glutinosa
                                                   [Narthecium glutinosum]
                                                   [Tofieldia glutinosa ssp. glutinosa]
                                                   [Tofieldia glutinosa]
                                                   [Tofieldia racemosa var. glutinosa]
                                             Triantha occidentalis
                                               Triantha occidentalis ssp. brevistyla
                                                     [Tofieldia glutinosa ssp. absona]
                                                     [Tofieldia glutinosa ssp. brevistyla]
                                                     [Tofieldia glutinosa var. absona]
                                                     [Tofieldia glutinosa var. brevistyla]
                                                     [Tofieldia glutinosa var. intermedia]
                                               Triantha occidentalis ssp. montana
                                                     [Tofieldia glutinosa ssp. montana]
                                                     [Tofieldia glutinosa var. montana]
                                               Triantha occidentalis ssp. occidentalis
                                                     [Tofieldia glutinosa ssp. occidentalis]
                                                     [Tofieldia glutinosa var. occidentalis]
                                             Triantha racemosa
                                                   [Tofieldia racemosa]