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:
Greyish-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 grey with longitudinal lines.

OTHER:
May seriously reduce productive potential of infested rangelands.

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