Cornish Biodiversity Network  -  Supporting Wildlife Recording

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Cornish Red Data (2009)

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.

Rorippa islandica - Northern Yellow-cress

Range & Status

Native. Eurosiberian Boreal-montane plant. A plant of the celtic areas of Britain and not found in England.

Regional Distribution

Only recently (2005) identified as being in Cornwall. In north-east Cornwall at Bude (SS20), and around Upper Tamar Lake (SS21), (growing with the similar Rorippa palustris ), and in two downstream sites beside the River Tamar (SX29). Some populations previously recorded as R. palustris may be R. islandica .

Habitat & Ecology

Around the muddy edge of a reservoir and in muddy puddles of a car park, and in wet

field-ruts beside the River Tamar.




Upper Tamar Lake is managed by the South West Lakes Trust, and other sites are not protected.


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.