Treehugger, the plant came "with" a container, was it a "hitchhiker" with another plant, or just an unnamed plant that you purchased? Just trying to figure out if it may be native or an alien as that may narrow down the possibilities.
It's easier to figure out what it isn't rather than what it is! The leaves are very distinctive in close-up, and so is the involucre below the corolla, which helps to eliminate a lot of things. I pondered about saxifrages for a while because of the leaves, but the flower doesn't seem to fit.
