meadow knapweed

Asterales > Asteraceae > Centaurea x moncktonii C. E. Britton

Meadow knapweed is a hybrid between brownray knapweed (Centaurea jacea L.) and lesser knapweed (Centaurea nigra L.). This perennial knapweed prefers moist roadsides, river banks, moist meadows and forest openings. Leaves are up to 6 in. (15.2 cm) long and 1 in. (2.5 cm) wide and decrease in size as they move up the stem. The lower leaves are toothed or lobed and the upper leaves are linear. Flowering occurs in May to August. Flowers are pink to purple, contained in heads and located at the tips of the branches. Bracts subtending the flower head are brown with a fringed margin. Seeds are 1/8 in. (0.3 cm) long. Meadow knapweed is native to Europe.


Identification, Biology, Control and Management Resources


Selected Images from Invasive.org

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Plant(s); in flower
Cindy Roche, , Bugwood.org
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Flower(s);
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
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Flower(s); seedhead
Cindy Roche, , Bugwood.org
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Stand;
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
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Invasive Reference(s):

Check Invasive.org for most current lists.
  • California - Invasive Plant Inventory
  • Colorado - Noxious Weed Law
  • Oregon - Noxious Weed Law


External Links


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USDA Forest Service Bugwood University of Georgia