meadow knapweed USDA PLANTS Symbol: CEMO6
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Centaurea moncktonii C. E. Britton[C. jacea X C. nigra]

Jump to: Images | Distribution Maps | Sources
Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae

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 1/8in. (0.3 cm) long. Meadow knapweed is native to Europe.

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s); in flower
Cindy Roche, , Bugwood.org
Additional Resolutions & Image Usage

Stand;
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s); In July
Great Smoky Mountains National Park Resource Management Archive, USDI National Park Service, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s); seedhead
Cindy Roche, , Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s); purple with white ray flowers
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s); white color morph
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s); hybrid with diffuse knapweed
Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.

Alternative content

Get Adobe Flash player





Invasive Listing Sources:
California Invasive Plant Council