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Russian Knapweed
Centaurea repens
A perennial, forming dense colonies by shoots from widely spreading black
roots. Stems are erect, openly branched, 18 to 36 inches tall. Lower
leaves are deeply lobed, 2 to 4 inches long; upper leaves entire or serrate,
narrow to the base. Cone-shaped flowering heads are 1/4 to 1/2 inch in
diameter, solitary at the tip of leafy branchlets. Flowers are pink to
lavender. Many pearly bracts form with rounded or acute papery margins.
Leaves of newly emerging plants (pictured above) are toothed and covered with
fine hair, giving them a blue-green color.
This species forms colonies in cultivated fields, orchards, pastures, and
roadsides. Russian knapweed plants spread by black, deep growing roots
which penetrate to a depth of over 8 feet. Flowering occurs from June to
September.
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