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Organism
  Plantae
      Tracheophyta
            Magnoliopsida
                    Crossosomatales
                            Crossosomataceae
                                     Apacheria
                                             Apacheria chiricahuensis
                                     Apalanthe
                                     Apargia
                                     Apargidium
                                     Apassalus
                                     Crossosoma
                                             Crossosoma bigelovii
                                                   [Crossosoma bigelovii var. glaucum]
                                                   [Crossosoma glaucum]
                                                   [Crossosoma parviflorum]
                                               Crossosoma bigelovii var. bigelovii
                                                     [Crossosoma parviflorum]
                                             Crossosoma californicum
                                     Glossopetalon
                                             Glossopetalon clokeyi
                                                   [Forsellesia clokeyi]
                                             Glossopetalon pungens
                                                   [Forsellesia pungens var. glabra]
                                                   [Forsellesia pungens]
                                                   [Glossopetalon pungens var. glabrum]
                                             Glossopetalon spinescens
                                               Glossopetalon spinescens var. aridum
                                                     [Forsellesia arida]
                                                     [Forsellesia nevadensis]
                                                     [Forsellesia stipulifera]
                                                     [Glossopetalon nevadense var. stipuliferum]
                                                     [Glossopetalon nevadense]
                                                     [Glossopetalon stipuliferum]
                                               Glossopetalon spinescens var. meionandrum
                                                     [Forsellesia meionandra]
                                                     [Glossopetalon meionandrum]
                                               Glossopetalon spinescens var. microphyllum
                                               Glossopetalon spinescens var. planitierum
                                                     [Forsellesia planitierum]
                                                     [Glossopetalon planitierum]
                                               Glossopetalon spinescens var. spinescens
                                                     [Forsellesia spinescens]
                                             Glossopetalon texense
                                                   [Forsellesia texensis]