noun (n)

• a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans(noun.plant)

  Synonym:
  apios americana, apios tuberosa, groundnut, groundnut vine, potato bean, wild bean
  

  source: wordnet30
• very tall American perennial of central and the eastern United States to Canada having edible tuberous roots(noun.plant)

  Synonym:
  giant sunflower, helianthus giganteus, tall sunflower
  

  source: wordnet30