I have two enormous (what I believe to be Maples) in my backyard. They are probably 60 feet tall with an irregular crown. I just moved in, so don't know fall color. The previous owner told me they were Sugar, but I don't think so. The leaf shape is softly lobed, and look much more like a Tulip Poplar than a Maple. The tree does not develop flowers however and does drop (lots and lots!) of keys. Help! I am so lost on this one...Thanks!