rockm

Poots, I don't think this is U. americana. American elm leaves aren't symmetrical at the base. One side of th eleaf usually bends back to the stem before the other, resulting in a lopsided effect.

That said, variation by locale, local speciazation and tree age (younger tree can produce very strange looking leaves), I wouldn't rule U. Ameircana out completely. I would think this would be another less well known elm species, though. It's an elm though. It will grow like a weed. Nice trunk too.