any acorns around? they have a verySawtooth oak? Is there any other oak that looks like this? This is MD, and the trees all appeared to be planted a good while ago.
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Bob,How about Halesia tetraptera or monticola also known as Caroline Silverbell, generally zone 4 - 8, but good specimen in Orono, Maine. Generally 30-40 ft tall, but co-champions in GSM National Park are 104,103, and 96. Fruit is a 4 winged corky drupe, flowers are showy white, 4 petaled, bell shaped 3/4 to 1 inch long.
Excellent reference to have is Virginia Tech Tree ID. Free app for phone or tablet.