The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
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.
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.