Could it be Aralia spinosa?
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Right on the edge of the range (at least according to https://www.fs.usda.gov/database/feis/plants/tree/araspi/all.html) but you may well be right. Preference for moist soils fits the distribution I was seeing. I'll believe this until proven otherwise. Thanks!
After looking at some pictures, I see why it's sometimes referred to as "devil's walking stick!"