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Russian Knapweed
Centaurea repens
 
Rosette

Basal leaves are lobed and are two to four inches in length.
Adult
A perennial, Russian knapweed grows two to three feet tall.
Flower

It has pinkish flowers. Bloom is early summer through late summer.
Weed Infestation

Russian knapweed is native to Eurasia. It infests rangelands, field edges, pasture, roadsides, and other disturbed soils. Knapweed's release chemical substances into the soil that inhibit the growth of competing vegetation. It can cause "Chewing disease" in horses that consume it.
Tap Root

Roots may go eight feet deep or more.
Flower Bract

Flower bracts have membranous cream-colored tips.
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