Black-Eyed Coneflower or more commonly, Black-Eyed Susans
Rudbeckia hirta
This native plant flowers mid- summer into fall on Cape Cod. See it most likely in people’s yards or as a wildflower along the roadside. Read about this native plan which is in the family Asteraceae.
https://gobotany.nativeplanttrust.org/species/rudbeckia/hirta/