| brown knapweed | USDA PLANTS Symbol: CEJA U.S. Nativity: Exotic Habit: Forbs/Herbs |
| Centaurea jacea L. |
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae |
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| Synonym(s): brown knapweed | |
| Native Range: Europe, n. Africa, n. & w. Asia (BAIL); | |
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. |
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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 |
 Plant(s); in flower Cindy Roche, , Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); Bruce Ackley, The Ohio State University, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Bruce Ackley, The Ohio State University, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Bruce Ackley, The Ohio State University, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Centaurea jacea - brown knapweed Rob Routledge, Sault College, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); seedhead Cindy Roche, , Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Bruce Ackley, The Ohio State University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Bruce Ackley, The Ohio State University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Centaurea jacea - brown knapweed Rob Routledge, Sault College, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Centaurea jacea - brown knapweed Rob Routledge, Sault College, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Bruce Ackley, The Ohio State University, Bugwood.org Additional Resolutions & Image Usage |
 Seed(s); Bruce Ackley, The Ohio 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 Alternative content
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 State(s) Where Reported invasive. Based on state level agency and organization lists of invasive plants from WeedUS database. Alternative content
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| U.S. National Parks where reported invasive: |
| Blue Ridge Parkway (North Carolina) |
