Five pronged seedhead.
No interactions present.
Now general considered to be a neophyte. First recorded on Steep Holm in 1803.
Likely to be a garden escape or throw-out, in which case it is probably a cultivar or hybrid of P. officinalis or P. lactiflora.
Ref Richard Lewis's comment.
Although this is true of most peonies found in the wild the Steep Holm population is Paeonia mascula.
Lat/Lng: 51.3403, -3.1111
OS grid ref: ST227607
Steep Holm - in Bristol Channel 5 miles of Weston-super-Mare