Lynda Townley's picture


Observed: 6th July 2012 By: Lynda Townley
S159 Neighbourhood Nature - current student

Lilac/pale purple knapweed with smaller inner petals surround by circle of less tight, open longer petals/sepals. Specimen is approximately 1m in height.

Species interactions

No interactions present.

Species with which Greater Knapweed (Centaurea scabiosa) interacts


Rachy Ramone's picture

Tell us about the bracts...

Hi Lynda,

Can you take a photo of the bracts? The underside of the flower, the rounded bulging part just below the petals.

The colour and arrangment of the bracts can be used to ID the plant.

If you look at them closely (through a hand lens if you have one) they are fascinating!

Rachy Ramone

How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:

lavateraguy's picture


Centaurea maculosa has only one British record - from Lincolnshire prior to 1970.

Pseudoradiate flowers are rare in the common knapweed (Centaurea nigra), but are normal in the other British species. The two likely alternatives are great knapweed (Centaurea scabiosa) and chalk knapweed (Centaurea debeauxii). These can be distinguished by the bracts - I think that this is Centaurea scabiosa, but the view of the bracts isn't quite good enough for me to be confident.