This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Smilax herbacea.
Lily Family. May - July.
A handsome vine growing 4 - 15 feet long, found in moist soil. Canada to Gulf States, west to Nebraska.
Greenish yellow, in inconspicuous clusters, ill-scented. Berries at first green, finally blue-black.
Somewhat heart-shaped, parallel veined.

Carrion-flower.
 
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