giant sunflower

Noun
  1. Very tall American perennial of central and the eastern United States to Canada having edible tuberous roots (synset 111999430)
    is a type of: helianthus, sunflower - any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays
    same as: helianthus giganteus, indian potato, tall sunflower

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