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Organism
  Plantae
      Tracheophyta
            Gnetopsida
                    Ephedrales
                            Ephedraceae
                                     Ephedra
                                             Ephedra altissima
                                             Ephedra antisyphilitica
                                                   [Ephedra antisyphilitica var. brachycarpa]
                                             Ephedra arenicola
                                             Ephedra aspera
                                                   [Ephedra clokeyi]
                                                   [Ephedra fasciculata var. clokeyi]
                                                   [Ephedra nevadensis var. aspera]
                                                   [Ephedra reedii]
                                             Ephedra californica
                                             Ephedra coryi
                                             Ephedra cutleri
                                                   [Ephedra coryi var. viscida]
                                                   [Ephedra viridis var. viscida]
                                             Ephedra distachya
                                             Ephedra fasciculata
                                                   [Ephedra clokeyi]
                                                   [Ephedra fasciculata var. clokeyi]
                                               Ephedra fasciculata var. fasciculata
                                             Ephedra funerea
                                                   [Ephedra californica var. funerea]
                                             Ephedra intermixta
                                             Ephedra nevadensis
                                             Ephedra pedunculata
                                             Ephedra torreyana
                                               Ephedra torreyana var. powelliorum
                                               Ephedra torreyana var. torreyana
                                             Ephedra trifurca
                                             Ephedra viridis