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Medusahead was brought to the United States from Eurasia.

A native plant of Eurasia, leafy spurge is an aggressive invader of pastures, rangeland, stream banks, and waste areas.

Dyers woad was introduced from Europe for production of textile dyes.

Dalmatian toadflax was brought to the United States from Europe, probably for ornamental purposes.

A deeply tap rooted biennial or short-lived perennial that grows 1-3 feet tall.

A winter annual grass that grows 6 inches to 2 feet tall.

Rosette leaves are deeply lobed and can reach 12 inches long.

Purple starthistle is a weed in rangeland, grassland, fields, disturbed areas, and along roadsides.

It is prevalent on poor soils, tolerates cold conditions, and survives drought well.

Native to Asia, Japanese knotweed is an escaped ornamental found along roadsides and waterways, in waste areas, and pastures.