| squarrose knapweed |
USDA PLANTS Symbol: CEVI USDA ARS GRIN: 316481 ITIS: 501352 NAPIS: PBFARBK |
| Centaurea virgata Lam. | |
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae |
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Squarrose knapweed is a perennial forb that can grow 12-18 in. (30.5-45.7 cm) tall. The leaves are alternate and deeply dissected. Flowering occurs in early to mid-summer, when pink flowers develop in heads at the tips of the branches. This species is sometimes confused with diffuse knapweed (Centaurea diffusa), but can be distinguished from diffuse knapweed by the floral bracts. Bracts on squarrose knapweed are curved outward and are not laterally toothed. Squarrose knapweed is native to the Mediterranean region and occurs in open disturbed sites, such as rangelands, roadsides, and grasslands. |
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| Selected Images from Invasive.org | View All Images at Invasive.org |
 Plant(s); post-fire emergence Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); in flower Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); seedhead Cindy Roche, , Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); USDA ARS Archive, USDA Agricultural Research Service, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); USDA ARS Archive, USDA Agricultural Research Service, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); from the eastern Mediterranean region is spreading on rangelands in the western United States. Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Sara Rosenthal, USDA Agricultural Research Service, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Control; Spraying after fire 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. Plants that Hog the Garden: Invasive Plants in the United States. Fine Gardening Online
- Pacific Northwest Exotic Pest Plant Council, 1998
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Arizona Noxious Weeds
- California Noxious Weeds
- Colorado Noxious Weeds
- Nevada Noxious Weeds
- Oregon Noxious Weeds
- Utah Noxious Weeds
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