That stuff grows around my place too. I never wondered what it was. Some years I'll take anything green that grows . It seems that everything does some good in this world. Last winter I noticed the Chickadees and Juncos were enjoying all the Crabgrass and Knotweed seeds in my back yard.
Looks like one of the "hop" clovers common in the south. Up here we
have yellow sweet clover which has a long flower stalk. Not sure if it
is common down your way or not.
What I call "Yellow Sweet Clover" grows well here also. It gets about 2-3 feet tall. I've planted it just for the heck of it. I think the bee keepers like it too. The OP picture is most likely Black Medic, now that I've looked it up and compared it to what volunteers around here in poor soil.
You might want to look up 'Birdsfoot Trefoil' which is a non-bloating legume related to clover and alfalfa. Your buds look a little small, but perhaps different north to south on them?