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Organism
  Plantae
      Tracheophyta
            Liliopsida
                    Alismatales
                            Tofieldiaceae
                                     Harperocallis
                                             Harperocallis flava
                                                   [Isidrogalvia flava]
                                     Pleea
                                             Pleea tenuifolia
                                                   [Tofieldia tenuifolia]
                                     Tofieldia
                                             Tofieldia calyculata
                                                   [Tofieldia palustris]
                                                   [Tofieldia racemosa]
                                             Tofieldia coccinea
                                             Tofieldia glabra
                                             Tofieldia pusilla
                                                   [Narthecium pusillum]
                                                   [Tofieldia palustris]
                                               Tofieldia pusilla subsp. pusilla
                                     Triantha
                                             Triantha glutinosa
                                                   [Narthecium glutinosum]
                                                   [Tofieldia glutinosa subsp. glutinosa]
                                                   [Tofieldia glutinosa]
                                                   [Tofieldia racemosa var. glutinosa]
                                             Triantha occidentalis
                                                   [Tofieldia glutinosa subsp. occidentalis]
                                                   [Tofieldia glutinosa var. occidentalis]
                                                   [Tofieldia occidentalis]
                                               Triantha occidentalis subsp. brevistyla
                                                     [Tofieldia glutinosa subsp. absona]
                                                     [Tofieldia glutinosa subsp. brevistyla]
                                                     [Tofieldia glutinosa var. absona]
                                                     [Tofieldia glutinosa var. brevistyla]
                                                     [Tofieldia glutinosa var. intermedia]
                                               Triantha occidentalis subsp. montana
                                                     [Tofieldia glutinosa subsp. montana]
                                                     [Tofieldia glutinosa var. montana]
                                               Triantha occidentalis subsp. occidentalis
                                                     [Tofieldia glutinosa subsp. occidentalis]
                                                     [Tofieldia glutinosa var. occidentalis]
                                                     [Tofieldia occidentalis]
                                             Triantha racemosa
                                                   [Melanthium racemosum]
                                                   [Tofieldia racemosa]