Good call, A.L.! It is Robinia pseudo-acacia, Black Locust. This is an impressive looking tree when it matures, but it is said to have nitrogen-fixing bacteria in root nodules and as a result, it inhibits the growth of many other plants (Google "Allelopathy"). Young trees (and young branches on older trees) have small but very sharp spines. The lower bark on mature trees is VERY deeply furrowed and distinctive (see below). This is why the lower trunk was cropped away from the plant quiz photo!
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Can you identify this tree just by its distinctive shape? Good luck! Please feel free to ID the tree or just take a guess. Photographed in St. Joe County, Indiana.
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