|diffuse knapweed|| USDA PLANTS Symbol: CEDI3
U.S. Nativity: Exotic
|Centaurea diffusa Lam.|
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
|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.
|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:|
|Craters of the Moon National Monument (Idaho)|
Dinosaur National Monument (Colorado)
Grand Canyon National Park (Arizona)
Rocky Mountains National Park (Colorado)
Yellowstone National Park (Wyoming)