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This seems to be abnormal growth, such as can be quite common in this species. I don't know the cause, but often you will see flower parts doubled or more, or a flower emerging from the centre of another one, which I think is what is happening here. It seems to happen more often with G. rivale than with other wildflowers.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 57.5, -6.7
OS grid ref: NG185552