I'm new to the forums, but I've checked thoroughly through previous posts to look at pics and see if anyone has what I have. I haven't found any.
A little background:
I was too busy last month to properly cut my lawn, *and* it didn't rain and was terribly hot. When I finally cut my lawn, I noticed that there was some sort of weed-type-thing that had taken over about half my lawn. In retrospect, it doesn't seem to be overtaking my entire lawn, but only the spots where the grass was weakest. Which turns out to be about half.
Anywho, I haven't been successful in identifying the plant. I thought it was spurge, but testing it like my friend suggested (breaking the stem to see if white stuff comes out) proved otherwise. I'm back to square one.
Here are some pics: