Apios tuberosa.

Botanical name: 

APIOS TUBEROSA, P. (Glycine apios, L.) Indian Potato, Potato Pea. Hopniss of the Delaware tribes. Noa of the Missouri tribes. Tucaha of the Southern tribes. Hanke or White apple of the Oregon tribes. Valuable plant, formerly cultivated by the Indians (yet by the Creeks) for the roots, which are like potatoes, or rather like Helianthus tuberosus, and the seeds like peas and as good. Deserving to be cultivated by us. The roots are white, tender, very good boiled or roasted, and in soups, or even raw when dried.

Medical Flora, or Manual of the Medical Botany of the United States of North America, Vol. 2, 1830, was written by C. S. Rafinesque.