Irish wildflowers
Photographs: Co. Cork |
Common Knapweed / Hardhead Centaurea nigra Minscoth Family: Asteraceae Flowering time: July-September. Perennial. Native. Flowers are red-purple on erect stems, the involucral bracts blackish-brown. Stalked lower leaves are oblong, sometimes pinnate, the upper leaves are stalkless, undivided. Slightly hairy plant. Variable. There is a rayed form Centaurea nigra var. radiata with enlarged outer florets. Abundant on roadsides, grasslands and waste ground. Similar:Greater Knapweed, Centaurea scabiosa Large purple flowers, found on calcareous grasslands. |
Knapweed, Centaurea nigra, Minscoth
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