Irish wildflowers

Common Knapweed / Hardhead
Centaurea nigra
Family: Asteraceae

Flowering time: July-September. Perennial. Native.

Flowers red-purple on erect stems. Involucral bracts blackish-brown. Lower leaves oblong, sometimes pinnate, stalked. Upper stalkless, undivided. Slightly hairy plant. Variable. Rayed form with enlarged outer florets. Height to 1m.

Abundant on roadsides, grassland, wasteland.

Similar: Greater Knapweed, C. scabiosa

Photographs above: Ballingeary, Co.Cork. July 2006

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