My gut reaction is to say that it's a Spuria, but that's just a preliminary suggestion. Many SPUs are much taller, but there are dwarf species and there has been work recently for dwarf varieties. I would like to be able to see more photos, but clicking the photo gave me a "The action that you were trying to perform has failed." message from photobucket.

I hope you keep it, whatever it is, because I really like it.

Thank You. That was the closest I could come up with by searching the net. It will stay in my garden, and most likely reseed itself as well. I like it too. It produces a lot of seed.

Here are some more pictures, I got the same message....