| diffuse knapweed |
USDA PLANTS Symbol: CEDI3 USDA ARS GRIN: 104125 ITIS: 36958 NAPIS: PBFARBC Bayer code: CENDI |
| Centaurea diffusa Lam. | |
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae |
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| Synonym(s): white knapweed | |
Diffuse knapweed is an annual, biennial, or short-lived perennial that is 8-40 in. (20-101.6 cm) tall. The basal leaves are lobed and stalked. The leaves become sessile, smaller, and less divided as they move up the stem. Flowering occurs from July to September, when white flowers develop in urn-shaped heads, in clusters, at the ends of the branches. The heads are subtended by leathery bracts. The lower and middle bracts have brown margins with spreading spines at the tips. Diffuse knapweed is native to southern Europe and north central Ukraine and prefers well-drained soils, roadsides, gravel pits, pastures and trails. |
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Identification, Biology, Control and Management Resources
- Element Stewardship Abstract - The Nature Conservancy
- Know Your Knapweeds - North Dakota State University
- Program Aid - USDA APHIS PPQ
| Selected Images from Invasive.org | View All Images at Invasive.org |
 Foliage; rosette Richard Old, XID Services, Inc., Bugwood.org Additional Resolutions & Image Usage |
 Seedling(s); Richard Old, XID Services, Inc., Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Cindy Roche, , Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); Richard Old, XID Services, Inc., Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); Sara Rosenthal, USDA Agricultural Research Service, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Management; Prescribed burn Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Control; burning; south of Shoshone, Idaho Steve Dewey, Utah State University, 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
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- Pacific Northwest Exotic Pest Plant Council, 1998
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Arizona Noxious Weeds
- California Invasive Plant Council
- California Noxious Weeds
- Colorado Noxious Weeds
- Idaho Noxious Weeds
- Montana Noxious Weeds
- North Dakota Noxious Weeds
- Nebraska Noxious Weeds
- New Mexico Noxious Weeds
- Nevada Noxious Weeds
- Oregon Noxious Weeds
- South Dakota Noxious Weeds
- Utah Noxious Weeds
- Washington Noxious Weeds
- Wyoming Noxious Weeds
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