Common blue violet

Viola sororia, known commonly as the Common Blue Violet, is a stemless herbaceous perennial plant that is native to eastern North America.
Self-seeding freely, in lawns and gardens it can become a weed. Cleistogamous seed heads may also appear on short stems late summer, early autumn.
Beyond its use as a common lawn and garden plant, Viola sororia has historically been used for food and for medicine. The flowers and leaves are edible, and some sources suggest the roots can also be eaten. The Cherokee used it to treat colds and headaches.