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Butterfly Bush flowers (Buddleja davidii).

Butterfly bush is a deciduous to semi-evergreen shrub with a weeping form that can get 6-12 ft tall. Flower colors may be purple, white, pink, or red, and they usually have an orange throat in the center that attracts butterflies. 

If you want more information about this flower, just search the plant's Latin name on Google:

butterfly bush

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