Viola selkirkii

Note the spur at the back of the bottom petal, which is wide and has a rounded end. Great-spurred violet can be distinguished from other purple violets by this spur and by its hairless petals. Long-spurred violet and dog violet have long, narrow spurs, and other purple violets in our area have at most a small spur. Great-spurred violet was believed to be extripated in Connecticut, but a wild population was found recently.