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Definition of: sunflower
Our photo definition of sunflower 
(sun′flou′ər) noun
Any of a genus (Helianthus) of tall, stout, rough herbs of the composite family, with large leaves and circular heads of flowers, those in the center tubular and usually purple, and those on the margin strap–shaped and bright–yellow; especially, the common sunflower (H. annuus), the source of an edible oil, and the State flower of Kansas.
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