Seen in my backyard by a riverbank. It was a small tree compared to the White Pines and Red Oaks around it. I know Slippery Elm's have pointed tips so that's my best guess, but maybe it's a type of Basswood? Thanks.
Slippery Elm Tree?
I don't believe this is any kind of Ulmus species at all. It has a shot at being a Tilia sp., but I won't be convinced till I see better images of stems, twigs, buds, etc.
Might be tough to get the whole tree, but those parts will help differentiate between genera.
Ditto to V V, probably a Tilia species, though the leaves are more symmetrical than is usual for that.
Elms have much narrower leaves, without the heart-shaped base.