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.

Gastridium ventricosum - Nit-grass

Range & Status

Native; a Mediterranean-Atlantic annual. In Britain it is found south of a line from London to Bristol and along the South Wales coast.

Regional Distribution

In Cornwall it was once found rarely, but is now confined to just one wall at Trelissick

(SW83). It used to grow in nursery beds at the base of the wall.

Habitat & Ecology

The top of a mortared wall.


It is threatened by the growth of climbing plants that dominate lower parts of the wall.


Trelissick is owned by the National Trust.


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.

Cornish Biodiversity Network. 2017.