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Pictorial key with terminology and plant part descriptions. (84 K PDF)
Descriptions of broadleaf and grass seedling plant parts used in identification.
Search online for weed, crop, and other plant images. The Strand Memorial Herbarium, which is located in the Department of Agronomy and Plant Genetics at the University of Minnesota, also contains plant mounts, seed samples, and a slide collection.
Annual broadleaf weeds
Photos and descriptions of common weed seedlings in Minnesota.
Minnesota broadleaf and grass seedling photos taken at the three- to five-leaf stage.
Photos and descriptions of mature weeds common in Minnesota.
Palmer amaranth and other pigweeds
A pictorial guide to the differences between these two pigweed species. To view accompanying notes, open file with Adobe, click on "View", scroll to "Comment", then select "Annotations." 2016 (6.1 MB PDF)
The University of Illinois Plant Clinic offers molecular confirmation of Palmer amaranth.
Molecular services submission form (Fee is $50)
Minnesota Department of Agriculture fact sheet on the discovery of Palmer amaranth in the state, legal status, identification, and steps to take if it is found.
Palmer amaranth was discovered in conservation plantings in Minnesota in 2016. As a "Prohibited – Eradicate Noxious Weed," it is critical to Minnesota's commodity crop producers to destroy this weed.
Palmer amaranth is the most competitive and aggressive pigweed species. It has significantly increased weed control costs and decreased yields where it has become established. While not native to Minnesota, it has spread northward from southern states to several neighboring states. Crop News
This video from Ohio State University describes four characteristics to help differentiate between redroot pigweed, waterhemp and Palmer amaranth: Pubescence (hair), petiole length, leaf shape and appearance, and inflorescence (seedhead). 2016
Kansas State University (1.1 MB PDF)
Annual grass weeds
Photos and descriptions of grass weed seedlings common in Minnesota.
Photos and descriptions of mature grass weeds common in Minnesota.
Photos and descriptions of perennial weed seedlings common in Minnesota.
Photos and descriptions of mature perennial weeds common in Minnesota.