It's not a rose. My first guess is a species of sumac (very, very, VERY unlikely to be poison sumac, which requires a wet environment and so is confined to swamps, marshes, and the edges of ponds, lakes and streams or rivers), my second guess is a species of ash (tree). If so the genus is either "Rhus" (1st guess) or "Fraxinus" (2nd).

I'll bet it's a walnut seedling. Do you have black walnut trees around? When they're young, the leaf structure looks an awful lot like a rose. One just like this fooled me earlier this year when it sprouted in my front border.

Connie

I'm with Connie. I dig BW seedlings out year round. Squirrels plant them. Black Walnut trees prohibit the growth of a lot of plants. Roses don't do real well close by. Mostly they are very messy trees! Lots of yard clean up to do.
Just MHO.

Barbara

I have to say, I'm a little disappointed! I was ready to pot it up and baby it and everything, just to see what the bloom would turn out like. Too bad.
I don't know if there are any Black Walnut trees nearby, since I don't even know what they look like. I'll have to check that out. Guess I had better dig up the little guy in case he causes problems with the plants around him.
Thanks everyone,
Judith

I forgot all about black walnut! Yes, that's probably what it is (or possibly some other nut tree, but that one's probably the hardiest of the native nuts).

You can confirm that it is a BW tree. Just dig deep enough and the nut will still be attached.

Barbara