One of the weedy Campanulas or Adenophora. I have no suggestion on control, unfortunately.

Here is a link that might be useful: my guess

Thanks

ohhhhh, man. that looks very similar to the stuff in my lawn. i hate spraying, but, it was getting so bad i had no choice. i used weed-b-gone and it seems to have done a pretty good job on the creeping charlie, but, this stuff just keeps coming back!!! it seems to shrivel it up for awhile, but, sooner or later it's back. grrrrrrrr!