This is the front side of the tree, perfectly harmless little suckers (I'm not being vulgar - that's what they're called) growing all over the front:
But walk around to the back with me. Yep. Just as I suspected. Poison ivy. Can you see it? If ever in doubt, remember this little poem, "Leaves of three, leave them be." So simple a toddler can remember it - if you ever teach them, that is.
Let's take a closer look. Hmm...1...2...3. I'm itching already. How about you?