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
Perennial broadleaf
A perennial from rhizomes with distinctive arrowhead-shaped leaves and red flowers and stems. Leaves initially develop as a basal rosette, but some leaves occur on the flowering stem as well. Basal rosette leaves occur on petioles and are 1 to 3 inches long, without hair, and arrowhead-shaped because of two lobes that occur at the leaf base. Leaves that occur on the flowering stem are arranged alternately, are usually linear in outline (not arrowhead-shaped), and are without distinctive petioles. All leaves have a thin membranous sheath (ocrea) surrounding the stem at the point of the leaf petiole attachment.
IPM1007, revised June 2007