Hard to tell at this point, Debra, tree peonies will put up new shoots from the ground as well. Once the leaves open up it'll be easier--tree peony and herbaceous peony leaves look different. If you get leaves from both it'd probably be a good idea to pinch out the herbaceous leaves as low to the ground as possible.
I'm pretty sure I saw a post last spring where another tree peony gardener actually dug up the roots and separated the 2, ended up with a tree peony and a herbaceous peony, both that grew. Your tree peony would have to be mature enough to be growing on its own roots for that to work, though!
