The common name is birdsfoot trefoil. It is a good animal forage plant but it can make really dense carpets that crowd out other vegetation. Either way, it is pretty. FataMorgana

We can't tell you which of three or four warm season grasses your lawn might be composed of. Centipede, St. Augustine, and Bermuda are the most common. Yours looks to be a combination of Centipede and Bermuda.....and Poa annua....the green weed grass. In my opinion, the best way for homeowners to control Poa is by the careful application of a pre-emergent herbicide in the fall. Such an herbicide is of zero use once the plant is growing. A pre-emergent application, properly timed, can do wonders to control annual weeds (like Poa) . There's no reason to use Roundup or other post-emergent herbicides. The Poa won't be so obvious when your permanent grass greens up. Just do your research (your local Extension service will be able to help) so that you apply the right chemical, at the right time, and at the right rate. It is NOT impossible to get rid of.

What has the temperature been like there in Atlanta lately? I'm going to go out on a limb here, and guess "pretty dang hot"! Lawns under heat stress, drought, or high temperature conditions should not have herbicides applied. Usually most herbicide labels mention 90° F, what we call "weeds" are usually VERY hardy compared with turfgrass, have deep taproots and/or waxy coatings on the leaves. Consequently while the weed plant defenses are at their best in tough growing conditions for turf, the grass plant may be damaged. When it's real hot and dry there isn't much of anything to be done for a lawn, at least cool season turfgrasses.

Yeah I had that happen to me a couple years ago with the over the counter weed b gone products..I never used them again and instead started buying the stuff the professionals use called Celcius..Its a little over $100 a bottle but a bottle goes a long way.(The application rate for 1,000 sq ft is alot cheaper than the bayer and weed b gon products you get at the box stores) .Celcius was designed for the heat for all the warm season grasses like bermuda, st Augustine, centipede and zoysia. But as far as your bermuda goes it will bounce back..It may take a few weeks in this heat we have here in georgia. Bermuda is the toughest grass out there.