Working at a nursery gives me many opportunities to bring home new or throw-away plants. We have beds planted around in different areas including one out by the street. Not too long ago we decided to clean it out as it had become taken over by weeds. I couldn't help but notice plants that were growing in amongst the weeds. They were going to be thrown out so I dug a couple up and took them home. I knew a couple were phlox and I thought that's what this one was but I have never seen a yellow blooming phlox.So, who knows what this is? I asked one of the guys and he thought it was some sort of rudbeckia. Well me not being completely sure of his answer asked someone else today at work. We have a beautiful patch of them blooming right now. He thought it was a type of coreopsis. Here's a foliage close-up. The buds do look exactly like a coreopsis. A rudbeckia bud has tiny petals that are folded up together which these do not have.
So in conclusion, unless someone out there in blogland can come up with a better answer, I think this is a coreopsis. I'm very happy about that because I have it in two areas in my beds and they are just now starting to bloom.