Lambsquarters, Chenopodium spp.
hortster

Can you get a better picture without the bright backlighting and maybe one of the entire plant? The leaves definitely look like lambsquarters, however the stem and branch structure don't. They remind me of cockle bur, but the leaves aren't right for that either.

I replanted my back yard with Black Jack Burmuda seed well over 6 months ago and I am starting to see this pop up in the grass in a lot of places. Before I replanted the grass I used Annual Ryegrass for one season and then killed it. I don't think this is ryegrass but looks more like a weed to me. I used Weed b gone and it did nothing....
Can you help me identify this?{{gwi:121465}}

Not sure, but you might compare it to barnyard grass, Echinochloa crus-galli.
hortster