Asteraceae
Centaurea
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Centaurea cyanus L.
garden knapweed, cornflower, bachelor's button
Introduced
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Centaurea jacea L.
= Centaurea debeauxii ssp. thuillieri
Dostál
brown knapweed
Introduced
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Centaurea montana L.
mountain knapweed
Cultivated
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Centaurea nigra L.
= Centaurea nigra var. radiata
DC.
black knapweed
Introduced
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Centaurea nigrescens Willd.
= Centaurea transalpina
Schleicher ex DC.
= Centaurea vochinensis
Bernh. ex Reichenb.
Tyrol knapweed, Vochin knapweed, Wocheiner knapweed, short-fringed knapweed
Introduced
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Centaurea phrygia L.
wig knapweed
Waif
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Centaurea stoebe ssp. micranthos (S.G.Gmelin ex Gugler) Hayek
= Centaurea australis
Pančić ex A.Kern.
= Centaurea biebersteinii
DC.
= Centaurea biebersteinii ssp. australis
(Pančić ex A.Kern.) Dostál
= Centaurea maculosa
auct. non Lam.
= Centaurea stoebe ssp. australis
(Pančić ex A.Kern.) Greuter
spotted knapweed, bushy knapweed
Likely Invasive
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Centaurea ×moncktonii C.E.Britton
= Centaurea jacea × C. nigra
= Centaurea pratensis
auct. non Thuill.
Monckton's knapweed
Introduced
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