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  Plantae
      Magnoliophyta
             [Angiospermae]
         Eudicots
             Core Eudicots
               Rosids
               Malvids
                    Crossosomatales
                            Crossosomataceae
                                     Apacheria
                                     Crossosoma
                                             Crossosoma bigelovii
                                                   [Crossosoma parviflorum]
                                             Crossosoma californicum
                                     Forsellesia
                                     Glossopetalon
                                             Glossopetalon spinescens
                                               Glossopetalon spinescens var. spinescens
                                                     [Forsellesia spinescens]