File:163 Centaurea cyanus L.jpg - Wikimedia Commons

Centaurea macrocephala (giant knapweed)

Centaurea cyanus L. Colombian Plants made accessible

Centaurea cyanus – chrpa modrá • Pladias: Database of the Czech flora and vegetation

File:Centaurea cyanus RF.jpg - Wikimedia Commons

Centaurea cyanus - Wikipedia

PDF) The complete chloroplast genome sequence of Centaurea cyanus (Asteraceae)

26 Centaurea cyanus botanical illustrations Images: PICRYL - Public Domain Media Search Engine Public Domain Search

Chemical features and bioactivities of cornflower (Centaurea cyanus L.) capitula: The blue flowers and the unexplored non-edible part - ScienceDirect

Centaurea cyanus - Wikipedia

Centaurea cyanus l hi-res stock photography and images - Alamy

Frontiers Indirect Selection on Flower Color in Silene littorea

File:Centaurea-cyanus.JPG - Wikimedia Commons

Centaurea cyanus, Cornflower: identification, distribution, habitat

Centaurea cyanus, Cornflower: identification, distribution, habitat

File:Cornflower (Centaurea cyanus) (36723431901).jpg - Wikimedia Commons