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Rubus sp.
Thorny, maroon stem. Leaves that grow in threes.
Lining a marsh in a forest.
Is this poison ivy?
Very true, but you were right, they do have leaves of 3, with the middle leaf on a longer stem, just like raspberry.
Wow, well, American Raspberry is a far cry from poison ivy, that's for sure. :)
The leaves and stems of poison ivy are smooth compared to this and it does not have red stems. This is definitely a Rubus species, but may not be strigosus.