potato bean
Noun
Meaning
a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans
nutlike tuber; important food of Native Americans
twining plant of Amazon basin having large edible roots
Source: WordNetSynonyms
groundnut
truffle
Indian potato
earthnut
groundnut vine
Apios americana
Apios tuberosa
Pachyrhizus tuberosus
yam bean
wild bean