|brown knapweed|| USDA PLANTS Symbol: CEJA
U.S. Nativity: Exotic
|Centaurea jacea L.|
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
|Synonym(s): brown knapweed|
|Native Range: Europe, n. Africa, n. & w. Asia (BAIL);|
Brown knapweed is a perennial plant that grows 1-3 ft (0.3-0.9 m) tall and invades dry fields, roadsides and meadows. The basal leaves are oblanceolate to elliptic and 2-10 in. (5 -25 cm) long. Leaves become smaller and more linear as they move up the stem. Flowering occurs from June to September, when magenta flowers appear in 1-1 1/4 in. (2.5-3.2 cm) wide, solitary heads at the tips of the branches. Brown knapweed is native to Europe.
Identification, Biology, Control and Management Resources
|Selected Images from Invasive.org||View All Images at Invasive.org|
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.
|U.S. National Parks where reported invasive:|
|Blue Ridge Parkway (North Carolina)|
|Invasive Listing Sources:|
|Faith Campbell, 1998|
|Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007|
|Mid-Atlantic Exotic Pest Plant Council, 2005|
|Pacific Northwest Exotic Pest Plant Council, 1998|