What is this

This invasive grass is coming up like crazy this year. In the desert landscape I give it a shot of Roundup, but I have a small (30X50 feet) grass area that has a zillion little shoots of this stuff. I don't want to use Roundup in the grass and kill off my hybrid tiff grass.
Help!!! What is this stuff and how to eliminate it in sodded areas???

A closer look

i dont know what it is either but i have it all over the place also and nothing eats it.