| Centaurea
cyanus
L. cornflower Introduced |
 
|
| Centaurea
jacea
L. brown knapweed Introduced |
 
|
| Centaurea
x moncktonii
C.E.Britton = C. jacea x nigra Monckton's knapweed Introduced |
                                 
|
| Centaurea
montana
L. mountain knapweed Introduced |
 
|
| Centaurea
nigra
L. black knapweed Introduced |
  
|
| Centaurea
nigrescens
Willd. = C. vochinensis Bernh. ex Reichenb. Wocheiner knapweed Introduced |
      
|
| Centaurea
phrygia
L. wig knapweed Introduced |
       
|
| Centaurea
stoebe ssp. micranthos
(Gugler) Hayek = C. stoebe ssp. micranthos auct. spotted or bushy knapweed Invasive |
                                                                                             
|