|common sunflower (Helianthus annuus)||
common sunflower (Helianthus annuus; COMPOSITE FAMILY [Asteraceae]) Tall (to 10') unbranched or sparingly branched annuals. Disk nearly flat, 1-2" wide in wild species, much wider in cultivated varieties. Rays large, strap-shaped, and bright yellow. Larger leaves broadly egg-shaped, toothed, long-stalked, and rough on both sides. Waste places and roadsides. Cultivated for its seeds and oil, native west of the Mississippi and occasionally escaped from cultivation elsewhere. Numerous other sunflower species are native to Wisconsin, usually in relatively open places. Flowers in summer and fall. 
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