Revised June 2007
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Contents
Summer annual broadleaf
Biennial broadleaf
Perennial broadleaf
Summer annual grass
Winter annual grass
Perennial grass
Plants resembling grasses
Herbicides
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Practical Weed Science for the Field Scout: Corn and Soybean
Summer annual broadleaf
An erect summer annual with large white to purple flowers and a distinctive odor. Seedlings have cotyledons that are thick, hairless, long and linear in outline, and with a clearly evident midvein. The stem below the cotyledon (hypocotyl) is initially maroon in color toward the base, eventually becoming maroon throughout. Mature plants have leaves that occur on long stout petioles and are large (3 to 8 inches long, 6 inches wide), ovate, without hairs, and with a few large triangular teeth along the margin. The fruit is a large egg-shaped capsule covered with spines; it splits into four segments when mature.
IPM1007, revised June 2007
