| diffuse knapweed | USDA PLANTS Symbol: CEDI3 U.S. Nativity: Exotic Habit: Forbs/Herbs |
| Centaurea diffusa Lam. |
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae |
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| Synonym(s): white knapweed | |
| Native Range: Temp. Asia, Europe (GRIN); | |
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
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| 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 |
| 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. |
