Maryland Meadow Beauty [Rhexia mariana] found at Creasman Farms, Hendersonville, North Carolina on 5 September 2020. It’s a member of the Meadow Beauty (Rhexia) family and has “eight conspicuous yellow stamens.” Newcomb’s Wildflower Guide, pages 160-161, states it blooms in summer in low meadows and sandy swamps.
USDA Plants Listing: Rhexia mariana