If I knew it came from the wild (North America), then I'd say it's a definite match. But not knowing what other similar species in the world might look like, there very well could be a Eurasian counterpart. In my opinion, for yourself, the ID is good enough, but not good enough for the Data base.

Thanks everyone! I have an ID which will allow me to select a permanent planting location for the plant.
I will mark this done.