You have identified:

Summer Grape
(Vitis aestivalis)

©2001 Horticopia, Inc.
Dr. Edward F. Gilman

General Information: Found in moist or dry soils, open forests, roadsides, and thickets, this high climbing vine blooms in late spring and early summer.  A member of the Grape family, it has no tendrils or flower clusters opposite every third leaf.  Leaves are usually 3 to 5, lobed, and, when young, are covered with a reddish or rusty cobwebby layer of dense hairs on both sides, and hairy on the underside.  The fruit is dark purple or black, ¼” to ½” in diameter.

Gleason, H. A.  1952.  The New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada.  3 vols.  New York: Hafner Press.

Newcomb, L.  1977.  Newcomb's Wildflower Guide.  Boston: Little, Brown, and Company.