assistance with identifying this weed
I live in central Florida and have st. Augustine for my lawn. I'm finding more and more patches of the following weed in my lawn. I've tried spraying Image(atrazine) on it but it appears to be unaffected. The seed pods easily get caught in fabric. I've done some searching, but I'm unable to determine what this weed is and am hoping that someone can identify it for me. Also, I'd be interested knowing how to kill this weed. Thanks!!!