flowers on drain-bank on somerset levels.
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one of the Water-Crowfoots (Crowfeet?) - related to the buttercups.
They're not easy, but there are some good botanists on the site that might be able to go further.
I agree with the above, but some better photos might be needed for a
Lat/Lng: 51.2483, -2.7382
OS grid ref: ST485501