The river Ouzel is practically choked with this plant a the moment
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think its river water crowfoot, suspect its on the species list of the nature trail round campus
River water crowfoot IS Ranunculus fluitans, which is what I identified it as. British Water Plants by Haslam, Sinker & Wolseley (1975) does not give it a common name.
University of Edinburgh and Biodiversity Observatory (OU)
Lat/Lng: 52.0, -0.8
OS grid ref: SP8837