This flower made it's way into one of my beds a couple of years ago. That same bed became a home for some purple columbine.
Do any of you know what this is?
That's the flower of Virginia Waterleaf (hydrophyllum virginiaum). In is a native plant that can be aggressive but is easy to control. It'll probably have flowers for another week or so.
Thank you misterpatrick. Especially the tip on it being aggressive. I will keep an eye on it.