Mat forming plant on sea cliffs
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Did you see this in April? Both Sea and Bladder Campion usually flower from June to August. The habitat you describe and the photo itself are indicative of Sea Campion rather than Bladder - but in April?
Yes we thought it was early, but we had also seen the same plant in Pembroke 2 weeks before. Couldnt think of anything else it would be.
In general the "jizz" of S. uniflora is different from that of S. vulgaris as in the latter the petals are much more deeply notched, often almost down to the base. However once you're close, look at the bracts. If they are herbaceous (ie green) then it's S. uniflora, if they're scarious then you have S. vulgaris.
BSBI VC Recorder
Lat/Lng: 49.9, -5.3
OS grid ref: SW6911