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  Plantae

      Charophyta

        Streptophytina

            Equisetopsida

              Magnoliidae

                    Crossosomatales

                            Crossosomataceae

                                     Apacheria

                                             Apacheria chiricahuensis

                                     Crossosoma

                                             Crossosoma bigelovii

                                               Crossosoma bigelovii var. bigelovii

                                                     [Crossosoma parviflorum]

                                               Crossosoma bigelovii var. glaucum

                                                     [Crossosoma glaucum]

                                             Crossosoma californicum

                                     Forsellesia

                                     Glossopetalon

                                             Glossopetalon clokeyi

                                                   [Forsellesia clokeyi]

                                             Glossopetalon planitierum

                                                   [Forsellesia planitierum]

                                             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. spinescens

                                                     [Forsellesia spinescens]

                                             Glossopetalon texense

                                                   [Forsellesia texensis]