Vitis rupestris

Vitis rupestris is a species of grape native to the United States that is known by many common names including July, sand, sugar, beach, bush, currant, ingar, rock, and mountain grape. It is used for breeding several French-American hybrids as well as many root stocks. The cultivar known as Rupestris St. George has been widely used in breeding and as a root stock; it is perhaps the best known.