Collected as rosettes 19 June 2013 in a seasonally flooded area. Flowering photos taken 9 July.
No interactions present.
How long are the seed pods? they look short and dumpy in photos.
... therefore palustris rather than sylvestris.
Thanks for this. The three biggest pods are 6, 8 and 9 mm, still green but probably not going to grow much more, and they are about the same length as their stalks. So yes, I agree palustris is the best fit.
I've added another picture, of a seed pod.
Lat/Lng: 53.9, -0.4
OS grid ref: TA052460