This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Family, Vine. Color, greenish. Sepals and petals, 4 or 5. Flowers, small, in a loose, slender panicle. bruit, a berry the size of a pea, not edible, blue or greenish, 1 to seeded. Leaves, heart-shape or square at base, pointed at apex, coarsely toothed, occasionally lobed, downy along the veins underneath. June.
A climbing, woody vine, along river-banks, from Virginia to Nebraska and south to Florida.
 
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