Vitis cinerea, the graybark grape, is a variety of grape. It has small black berries that are mildly unpleasant to eat. It grows in Oklahoma and Texas. It is also known by the name "winter grape" or "possum grape."Vitis cinerea is an American native grape. The leaves are cordiform-emarinate, flabby, dull, limb finely wrinkled (like crepe) between the sub-veins. The teeth of the leaf are very blunt. The buds are grey-ashy-violet.