WordNet sense 1 (a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans):

groundnut, potato bean, Apios americana, Apios tuberosa, groundnut vine, wild bean

WordNet sense 2 (very tall American perennial of central and the eastern United States to Canada having edible tuberous roots):

giant sunflower, Helianthus giganteus, tall sunflower