No interactions present.
Needs close-up of flowers or seed, appears too delicate to be R.obtusifolius. Basal leaves & lower stem leaves would be useful too along with PERTINENT details of habitat. (It may be growing in a pond in which case it might be Water Dock.)
No pond, it was a just in a patch of neglected grass next to the road.
Lat/Lng: 51.1, -0.2
OS grid ref: TQ2636