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Added: 20th September 2011 Description:
I'm wondering if this flower is the same as the last picture I put on, but a t a later stage of flowering. The flowers like this were taller - about 14 -18 cm (from memory. I found them a little further along the path, perhaps less exposed?
Confidence: It's likely to be this, but I can't be certain.
Confidence: I'm as sure as I can be.
Confidence: It's likely to be this, but I can't be certain. Notes: We cannot see the involucral bracts, or have a clear view of the leaves, and consequently it is difficult to be absolutely certain of the ID, but all visible evidence points to C. debeauxii. To be blunt, posting just a single photo of the flower from above was not very helpful. This is the plant we older botanists knew as C. nemoralis, which was sunk into C. nigra, but recently has been separated off again under, to most of us, a new name. The photograph is of the radiate (or technically "pseudo-radiate") form of C. debeauxii. Radiate plants are quite common in C. debeauxii, much rarer in true C. nigra, and lead to confusion with Greater Knapweed (C. scabiosa), which is more often radiate than not.
No interactions present.
Other observations of Common Knapweed ( Centaurea nigra) Species with which
Common Knapweed ( interacts Centaurea nigra)