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; Oceanic Southern-temperate species. Apart from on The Lizard, the largest
populations are in south-east England and west Wales, particularly Pembrokeshire.
It has been recorded in Cornwall from 91 1km squares in total. The greatest concentration has been on The Lizard and West Penwith. Elsewhere it was mainly found away from the coast throughout Cornwall. Currently, of the 21 remaining 1km squares, all but five are on The Lizard.
Habitat & Ecology
Mainly found in nutrient-poor, shallow pools which are water-filled in winter and are dry in summer. A feature of trackways on The Lizard.
Habitat destruction is the greatest threat. Hybridisation with Ranunculus omiophyllus is a threat at sites except on The Lizard where R. omiophyllus does not occur.
A recent programme of trackway restoration at Ruan Pool has successfully demonstrated that re-colonisation can occur after appropriate management. Most sites are SSSI.
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.