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I was torn between bladder and sea campion.
We have got Bladder Campion flowering in our local country park right now in the East Midlands. I feel it is more likely to be if it is flowering at this late time of year.
... despite being posted now, the observation was made in June. The ID has been confirmed, so I'm sure you're right. I just wish I knew how to tell!
I have seen Bladder Campion flowering today not far from where i spotted some in flower the other day.
Lat/Lng: 55.63, -1.17
OS grid ref: NU523376