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edge of mixed deciduous forest near road.
This is either Ladybells (Adenophora confusa: http://davesgarden.com/guides/pf/go/589/...), or Creeping Bellflower (Campanula rapunculoides: http://montana.plant-life.org/species/ca...). They're related to each other, but the bellflower has become a real problem in some states, while Ladybells don't seem as likely to escape. I'm guessing it's Campanula, since it's common enough in the Boston area to be found 'wild".