Central Taxonomic Thesaurus
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  Plantae
    Tracheophyta
           [Tracheobionta]
    Spermatophyta
      Magnoliophyta
             [Angiospermae]
         Eudicots
             Core Eudicots
                    Saxifragales
                            Penthoraceae
                                     Penthorum
                                             Penthorum chinense
                                                   [Penthorum sedoides var. chinense]
                                             Penthorum sedoides
                                               Penthorum sedoides subsp. sedoides