potato bean

(noun) twining plant of Amazon basin having large edible roots. Synonyms: yam bean, Pachyrhizus tuberosus.

(noun) a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans. Synonyms: groundnut, groundnut vine, Indian potato, wild bean, Apios americana, Apios tuberosa.

(noun) nutlike tuber; important food of Native Americans. Synonyms: groundnut, wild bean.