Knapweed, Brown, Centaurea jacea

Life Cycle

Perennial.

Propagation

Reproducing only by seed.

Stems

Erect, much branched, 20-180 cm high, opposite orientation and greenish or purplish striped (Figure 3).

Leaves

Leaves in a basal rosette the first year,

Legislation

Noxious under the Ontario Weed Control Act.


Figure #1.

Brown knapweed. A. Base of plant. B. Leaf and short branch at mid-stem. C. Leaves at top of stem. D. 1 involucral bract.


Figure #2.


Figure #3.

Figure showing stem orientation.


Figure #4.

Leaf of brown knapweed.


Figure #5.

Mature flower.


Figure #6.


Figure #7.


Figure #8.

Woody root of brown knapweed.