Aesculus parviflora

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Aesculus parviflora, the bottlebrush buckeye or small-flowered buckeye, is a species of suckering deciduous shrub in the family Sapindaceae. It is native to the southeastern United States, where it is found primarily in Alabama, locally in western Georgia, and with a disjunct population in South Carolina along the Savannah River. Its natural habitat is in mesic forests, on bluffs and in ravines.

Summary from Wikipedia