Other names: Common or wild sunflower
Life cycle: Annual
Found in: Cropland, roadsides and waste areas throughout the U.S.
General description: Very tall erect plant with large yellow blooms.
Seedlings: Cotyledons are bright green and twice as long as they are wide.
True leaves: Arranged alternately along the stem except for leaves at the base, which are opposite. They are triangular, 4" to 12" long and hairy with serrated edges.
Flowers and fruit: Flowers are bright yellow with brown centers. Fruit is small, gray or black, wedge-shaped, flattened seeds.