The American Windflower (Anemone canadensis) is native throughout much of the US, in SC PA they are native to Cumberland, Dauphin, and Franklin counties.
It is a fairly low-growing perennial with deeply-cut leaves. It blooms prolifically in spring with white flowers. This particular windflower needs a more sheltered location than others, as it's stems can be broken by the wind. It grows along river margins and low floodplanes in full sun to part shade. It is tolerant of deer and clay soil, but can be quite aggressive in the garden.
Sources: Missouri Botanical Garden, USDA