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  Plantae
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     Streptophyta
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        Spermatophytina
            Magnoliopsida
                  Asteranae
                    Gentianales
                           [Rubiales]
                            Gelsemiaceae
                                     Bigonia
                                     Gelsemium
                                             Gelsemium rankinii
                                                   [Gelsemium rankii]
                                             Gelsemium sempervirens
                                                   [Bigonia sempervirens]