Everyone has great guesses but none of them are right. Those choices are close to the way that people describe this tree to be similar to many of those you named, but no one has even named the genus yet.
Also David, Bur oak? Really? Did you steal Tom's computer.
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I tell ya, when it's one you see frequently (I have two on my property) you just know it for sure.
Also if anyone posts any of our common native species i have here in Maryland, the answer just hits ya fast, pretty much no matter how bad the picture or how far away.
Tom and Robinia and a few others; you guys amaze me on the knowlege you have on the more exotic stuff. I usually don't get that stuff unless there is a hint or I can see something to track it down on the internet.
TreesPlease, any way to get the answer goes. memory, tree id book, google, hacking into Tom's computer, whatever it takes to get the right answer.