An annual of saltmarshes, sea-walls, muddy shingle, brackish grazing pastures and the base of coastal cliffs. Inland, it is a local colonist of the margins of saline sludge lagoons, and also occurs beside salt-treated roads. Generally lowland, but reaching 520 m on a roadside at Holme Moss (Cheshire).
There are many more coastal records of this species than in the 1962 Atlas, probably due to better recording. Since the late 1970s it has undergone a remarkable expansion of range along inland roadsides.
Circumpolar Southern-temperate element; widely naturalised outside its native range.
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.
Atlas text references
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1983)
1977. The vegetation of British inland salt marshes. Journal of Ecology. 65:673-698.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1985. The updated distribution of maritime species on British roadsides. Watsonia. 15:381-386.
1982. De-icing salt and the invasion of road verges by maritime plants. Watsonia. 14:41-52.