any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays

sunflower of eastern North America having narrow leaves and found in bogs

annual sunflower grown for silage and for its seeds which are a source of oil; common throughout United States and much of North America

very tall American perennial of central and the eastern United States to Canada having edible tuberous roots

tall rough-leaved perennial with a few large flower heads; central United States

tall perennial of central United States to Canada having golden-yellow flowers

similar to the common sunflower with slender usually branching stems common in central United States

tall perennial with hairy stems and leaves; widely cultivated for its large irregular edible tubers