Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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Eleanor Saulys http://www.ct-botanical-society.org/galleries/centaureanigr.html<br />
Knapweed<br />
Black - Centaurea nigra, Brown - Centaurea jacea, Meadow (hybrid) - Centaurea × moncktonii<br />
Asteraceae (Sunflower Family) Category: Prohibited Noxious<br />
Black Knapweed<br />
Cindy Roche<br />
Meadow Knapweed (Hybrid)<br />
Brown Knapweed<br />
Brown Knapweed<br />
• Information: Introduced from Eurasia, weed of disturbed areas, tolerates<br />
a wide range of conditions (brown knapweed prefers cool, moist areas),<br />
weed of hayland, Meadow knapweed is a hybrid of black and brown knapweed.<br />
• Life Cycle: Herbaceous perennial.<br />
• Root: Woody crown, woody taproot.<br />
• Leaves: Leaves are not highly divided like many of the other knapweeds.<br />
• Stems: 20-80cm, branching mid stem.<br />
• Flower: Pink, purple, comb-like bracts below flowers. Brown knapweed<br />
has brown bracts and the tips of the bracts of black knapweed are black.<br />
Meadow knapweed can be either.<br />
• Seed/Fruits: Reproduces by seed.<br />
• Toxicity: Allelopathic (toxic) towards other plants.<br />
• Control: Long-term control, hand pick, chemical.<br />
30<br />
www.microscopy-uk.org.uk/mag/artmar06/bj-knapweed.htm<br />
www.microscopy-uk.org.uk/mag/artmar06/bj-knapweed.htm
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