This is a little plant and a very small flower. It appears to me, to be a member of the viola family, but I am not able to determine exactly which one. An alpine viola is my best guess.
In the upper right corner of the photo is a ‘normal’ violet leaf, which looks relatively large, but is not really.
A gardening friend warned me this cute little flower can be invasive. So far, I still see it as a welcome addition to my haphazard flower garden. Although, it is moving in freely, I have no objections as it fills space and can bloom through the summer. I know I should be wary, as I spend too much time pulling out a plant I liked at first, but then became overwhelming.
susansflowers 