Definitely Desmodium. Is it a low-growing, trailing plant? It reminds me of Creeping Tick Trefoil (Desmodium triflorum) that grows here. I have another tall growing Desmodium that I noticed a few days ago behind my deck; I need to get out tomorrow and take pictures and try to ID it.
~ I'm an old gal who still loves playing in the dirt!
~ Playing in the dirt is my therapy ... and I'm in therapy a lot!