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.
Wild Bean. Apios tuberosa.
Pulse Family. July - Sept.
A climbing vine, 3 - 6 feet high, found in low, moist ground. New Brunswick to Minnesota, south to Florida, Louisiana, and Kansas.
Maroon and pale brown-lilac, fragrant, borne in short, thick clusters from the leaf angles.
Compound, 3 - 7 oval leaflets.
Rootstock bears edible, tuberous enlargements.

Groundnut.
 
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