Looks like ladybells,(less invasive) although, the fact that there are many areas where this plant is growing may point to Campanula rapunculoides, similar looking, which is very invasive. It is also called Creeping Bellflower, Rampion Bellflower, June Bellflower. If it gets a blue flower spike, you have one of these plants.
Campanula rapunculoides has creeping rootstalks, which is a stem of a plant that sends out roots and shoots as it spreads. Some say that cold winters make it less invasive, but it is a curse to some gardens.
