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Sunflower, any of various tall plants (genus Helianthus) with large, disk-shaped yellow and brown flowers that twist to face the sun. Most of the 60 species are native to the United States. The common sunflower (Helianthus annuus) is cultivated in many parts of the world. The seeds yield an oil and the remainder becomes cattle feed.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Sterility to Swedish