Hello.  These are photos I took of a suspicious vine growing in my backyard.  I hereby grant you permission to use these photos on your website.

In this photo, I know the 5-leaved plant to the right is Virginia Creeper.  Can you identify the 3 leaved plant in the center?  I have several patches of this plant growing in our yard in full sun.  (If it helps with identification, I live in Alabama.)

I've been very careful not to touch it, so I don't know if it will produce a rash.  Thank you!