This plant is growing in my son's yard in Pennsylvania. He didn't plant it; he said it came up around the same time as the daffodils and is about 24 inches tall; flowers haven't completely opened yet.
ID - if possible please
The leaves look so familiar but the flower is throwing me off.
The flowers are reminiscent of Crown Vetch, but the leaves aren't right..
Try the Plant Identification Forum. They're so good and so fast!
http://davesgarden.com/community/forums/f/plantid/all/
Thanks -- I've just posted it to the ID Forum.