Common yellow woodsorrel
Again. This is me rethinking something that I am constantly -trying- to remove from my garden. I have fond memories of this plant from when I was young... My mom taught me when I was a kid that the leaves were edible and tangy. I learned later in life that eating a small bit of oxalis is fine, but we shouldn't overdo it. https://www.livestrong.com/article/472236-side-effects-of-oxalic-acid/
So when woodsorrel showed up in my garden, I had a love/hate thing going on with it. I googled common woodsorrel to find out it is a Florida Native http://www.fnps.org/plants/plant/oxalis-corniculata and decided instead of trying to yank it out (nearly impossible anyway) from under my peaches and blackberries, that I am going to embrace yet another "weed" groundcover into my garden in certain areas.