Wood violet

Viola sororia is a stemless herbaceous perennial plant that is native to eastern North America. It is known by a number of common names including; Common Meadow Violet, Purple Violet, Woolly Blue Violet, Hooded Violet and Wood Violet.
It is the state flower of Wisconsin, Illinois, Rhode Island, and New Jersey.
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.