Range & Status
Sparsely distributed in Britain from N. and S. Wales southwards to S. Devon. Known elsewhere in Ireland, Belgium, France, Spain, Macaronesia and N. and C. Africa.
Known from three localities on the banks of the River Tamar and a tributary, SE. of Penscombe, SE. of Luckett and near Greystone Bridge.
Habitat & Ecology
Within the flood-zone, on mud, soil or clay of banks, sometimes among rocks, often where partly shaded. Capsules mature in summer.
Not immediately threatened, but potentially at risk from alterations to river banks or changes in water quality or flooding regime in the R. Tamar.
The Environment Agency monitors and manages changes in and alongside the river, which receives some statutory protection.