Lawn Weed ID
I'd appreciate if anyone can help identify this weed. I've spent hours pouring over pictures online, but I can't seem to nail it down. I live in CT and this weed seems to last all season (doesn't really die mid-summer like a winter annual). I have TONS of it in my lawn and it drives me crazy - Weed & Feed doesn't touch it. On the edges of my yard it will grow a foot or more high and flower. The attached image is about 4" high. There are 6 leaves whorled around a central point evenly spaced up the stalk.
Many thanks in advance!