This was the only clump I saw on this trip. It was growing on an east facing clay slope weathered from a shale.
Viola (US /vaɪˈoʊlə/ and UK /ˈvaɪ.ələ/) is a genus of flowering plants in the violet family Violaceae. It is the largest genus in the family, containing between 525 and 600 species. Most species are found in the temperate Northern Hemisphere, however some are also found in widely divergent areas such as Hawaii, Australasia, and the Andes.