I have a friend that has this plant taking over his grass, do you know what it is? Thanks

Cindy! I'm sure I know this plant but the ID is not coming to me. You could try posting the picture on the Plant ID forum unless someone on this forum recognizes it beforehand. It would be helpful to know roughly where the plant is growing, i.e. country and, if North America, the state or province.

Plant ID Forum:
http://garden.org/forums/view/...