Today I saw what appeared to be poison ivy growing upright like a tree. I looked closely to make sure that it wasn't just a poison ivy vine growing up a tree, but this one had a woody trunk about two inches in diameter and was about 8 feet high. I know that it can take on the form of a low shrub, but I have never seen it like this. Could this be something other than poison ivy? It had the classic three-leaf triplets all over it - looked like a lot of pictures that I had seen. I would like to identify it so that I can decide if it needs to come down. Thanks!