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
Native. Suboceanic Southern-temperate species. Most common in central Ireland,
Anglesey, coastal Wales, the New Forest and scattered elsewhere, including Scotland.
Found west of a line from Wadebridge (SW97) to Fowey (SX15), with the largest
concentration on The Lizard, but also found at Penhale Sands (SW75), Booby' s Bay
(SW87), Goss Moor (SW95) and near St. Buryan (SW32). There were many other sites in this area. On the Isles of Scilly it occurred on St. Mary' s (SV91) until 2000.
Habitat & Ecology
Pond margins, pools, boggy flushes, dune-slacks, and muddy tracks. Open conditions are required for this plant to thrive.
Drainage, competition from other plants, drying out of habitat, and mis-management of existing habitat.
Most sites are in protected areas, however, it continues to decline in these areas.
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.