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Poss Knapweed

Observed: 23rd September 2011 By: spacemousesspacemouses’s reputation in Plants
Poss Knapweed
Description:

Flower heads about 18mm across. I would call the purple one 'Knapweed'. My book does not mention (that I can see) anything about the white one! They on same plant when I picked them. (Weather too bad for outdoor pic today)

Identifications
Species interactions

No interactions present.

Species with which Common Knapweed (Centaurea nigra) interacts