Common Name: Brown Knapweed
Latin Name: Centaurea jacea L.
Reviewer: Monika Chandler
Affiliation/Organization: Minnesota Department of Agriculture
File #: MDARA00017BRNKNW_1_18_2013
Brown knapweed is an herbaceous perennial native to Europe (Wilson and Randall 2003). In Europe, both diploid and tetraploid variations of brown knapweed coexist (Hardy and Vekemans, 2001). Tetraploids and can hybridize freely with black and meadow knapweeds, also tetraploids. Brown knapweed prefers cool, moist, and sunny habitats.
Brown knapweed was introduced to western North America for forage, but it is not palatable and has low nutritional. Only two brown knapweed plants/infestations have been detected in northeastern Minnesota.
Review Entity | Outcome
NWAC Listing Subcommittee: Suggest regulation as a prohibited noxious weed. Have to decide whether to place on eradicate or control list; or whether to combine all knapweeds.
Comments: Subcommittee debated 2 options: 1. List as a prohibited eradicate with meadow knapweed due to small distributions in state; 2. Combine meadow and brown knapweeds with spotted knapweed as a prohibited-control knapweed complex - this would be done because it is hard to distinguish between the knapweed species and they can hybridize.
NWAC Full-group: List as a Prohibited – Eradicate Noxious Weed
MDA Commissioner: Approved as a Prohibited – Eradicate Noxious Weed – 1/14/2013
Hardy, O.J. and X. Vekemans. 2001. Patterns of allozyme variation in diploid and tetraploids Centaurea jacea at different spatial scales. Evolution 55(5): 943-954.
Roché, C.T. and B.F. Roché, Jr. 1991. Meadow knapweed invasion in the Pacific Northwest, U.S.A., and British Columbia, Canada. Northwest Science. 65(1): 53-61.
Wilson, L.M., and C.B. Randall. 2003. Biology and Biological Control of Knapweed. USDA-Forest Service FHTET-2001-07. 2nd Edition.