I took these "grape" pics yesterday...I originally thought these were grapes. I wanted to taste them, but, they were too high and I could not reach them. These are growing near a lake down the street from my house. A friend of mine warned me that it might be moonseed.
Moonseed is very poisonous and folks sometimes confuse moonseed with grapes.
I Googled moonseed and grapes. After comparing the definitions of both, I've come to the "conclusion" that these plants are moonseed. When you are out walking and viewing plants, please be careful!