Ulmus sp. I think. I don't know US elms so can't say which one.

If you can tell all the European elms just from suckers you have an amazing unique ability.

Not only are the species elms and the older cultivated forms difficult there are multiple new hybrids on the market.

But it's possible the one being asked about is just another Siberian elm, I'm not sure.

Thank you both! On looking at pictures of the elms, I believe they are winged elms. I think I will rescue them in the fall and plant in an open area.

bboy - I did not intend to imply I could id European elms either, just that I don't know US ones.

Yes, that's a winged elm. Definitely. You should see more of those wings as it matures.