Common Sunflower

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Cotyledons.  Key characteristics: common sunflower cotyledons are much shorter and spatula-shaped (left) compared to the longer and nearly linear-shaped cotyledons of common cocklebur (right).

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Seedling.  Key characteristics: first true leaves are opposite and more longer than narrow; three prominent veins become apparent.

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Foliage.  Key characteristics: as the plant develops, leaves become heart-shaped and contain three major veins.

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Flower and infested corn crop.


Seed.  Seed are covered with black, gray and brown hairs imparting a mottled appearance.  They are tooth-shaped and range in length from 5.0 to 8.0 mm. 

Life cycle: summer annual.