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Button Bush flowers (Cephalanthus occidentalis).

Botton bush is a diciduous shrub about 5-12 ft tall. It is common throughout Missouri, most frequently occurring in wet open areas, low woods, thickets, swamps, upland sink-hole ponds, river bottomland and stream/pond margins. 

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

button bush

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