Looks like Dove Weed or Smooth Crab Grass. Does not really matter what it is as the control for all broad leaf grassy weeds are the exact same. Best control is is get control before it emerges using pre-emergence herbicides. Too late for you.

For post emergence use any type for broad leaf control and safe for you lawn type. MAMA was excellent but the Employment Prevention Agency decide you should not use it. Today try a product containing quinclorac aka Weed-B-Gone Max + Crab Grass Control available at any box store. It also contains 2,4-D, MCPP and dicamba, which will control just about every weed there is.

This post was edited by texas-weed on Sun, Jul 14, 13 at 15:08