A rhizomatous perennial herb of wet meadows, wet woods, fens, the margins of lakes, ponds and watercourses, wet dune-slacks, and, in N. and W. Britain, also of coastal streams, shingle, upper saltmarshes and raised beaches. It reproduces by seed and by vegetative spread. Plants have occasionally been planted in the wild or have escaped from cultivation. Generally lowland, but reaching 480 m at Nenthead (Cumberland).
The 10-km distribution of I. pseudacorus has been stable since the 1962 Atlas.
European 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.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1997. Aquatic plants in Britain and Ireland.
1990. Biological Flora of the British Isles. No. 169. Iris pseudacorus L. Journal of Ecology. 78:833-848.