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Diffuse Knapweed
Diffuse Knapweed  

DIFFUSE KNAPWEED

(Centaurea diffusa Lam.)

GROWTH HABIT: Annual or biennial, bushy, up to 2 ft. tall. Rosette formed first year, flowering stalk elongates second year.

LEAVES: Grayish-green, alternate, basal leaves whorled, upper leaves much reduced. Covered with fine hair.

STEM: Hairy, erect, single main stem from a rootstock, branched near or above the base.

FLOWER: Solitary, usually white, sometimes pink, rose or lavender; seedhead bracts end as sharp, rigid spines.

ROOTS: Elongated taproot.

SEEDS: Oblong, dark brown or gray with longitudinal lines.

OTHER: May seriously reduce productive potential of infested rangelands.

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