Helianthus giganteus

Helianthus giganteus, the giant sunflower or tall sunflower, is a species of Helianthus native to the eastern United States and eastern and central Canada, from Newfoundland west to Alberta south to Minnesota, Mississippi, and South Carolina.

Description
Helianthus giganteus is a perennial herbaceous plant that can grow up to 4-5 m tall. The leaves are slender and lanceolate. The flower heads are bright yellow, up to 7 cm in diameter. They are most commonly found in valleys with wet meadows or swamps and even near river banks.

Cultivation and use
The Choctaw Indians of the southeastern United States have traditionally cultivated the Helianthus giganteus and made a palatable bread by mixing the ground sunflower seed with that of ground maize.