Abstract
FourCentaureaspecies, diffuse knapweed (C.diffusaLam. # CENDI, spotted knapweed (C.maculosaLam. # CENMA), yellow starthistle (C.solstitatilisL. # CENSO), and the closely related Russian knapweed [Acroptilon repens(L.) DC. syn.Centaurea repensL. # CENRE] are serious introduced weeds which infest extensive areas of pasture and rangeland in Canada and the United States (1, 10, 14, 17, 18, 26, 30). Russian knapweed and yellow starthistle are also troublesome in cultivated land (1, 14, 26). These four species are members of the Cardueae tribe of the Asteraceae family and have been accidentally introduced from Eurasia as contaminants in crop seed.
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