A rhizomatous perennial herb which is naturalised in reed swamps and by lakes, ponds and streams. It arises from deliberate planting, or as a garden escape or throw-out. Lowland.
I. versicolor was being cultivated in Britain by 1732 and is now very popular in water- and bog-gardens. It was recorded from the wild in 1893 (S.W. Yorks.) and is much more frequent now than when it was mapped in the 1962 Atlas.
Native of eastern N. America.
Atlas Change Index: 0.62
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