| brown knapweed |
USDA PLANTS Symbol: CEJA USDA ARS GRIN: 9821 ITIS: 36962 NAPIS: PBFARBE |
| Centaurea jacea L. | |
|
Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae |
|
| Synonym(s): brown knapweed | |
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
- Weed of the Week - USDA Forest Service
| Selected Images from Invasive.org | View All Images at Invasive.org |
 Flower(s); seedhead Cindy Roche, , Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); in flower Cindy Roche, , Bugwood.org Additional Resolutions & Image Usage |
Taxonomic References:
- USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Invasive Listing Sources:
- Faith Campbell, 1998. Plants that Hog the Garden: Invasive Plants in the United States. Fine Gardening Online
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- Pacific Northwest Exotic Pest Plant Council, 1998
- Virginia Department of Conservation and Recreation, 1999.
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Oregon Noxious Weeds
- Washington Noxious Weeds
Partners
