A compact to spreading, rhizomatous perennial herb found in marshes, wet meadows and pastures, often near the sea and sometimes in brackish conditions, occasionally with J. gerardii. 0-370 m (above Dent station, N.W. Yorks.).
J. compressus has always been confused with J. gerardii, especially on the coast. It could well be under- or over-recorded. Many recent county floras record a decline because of drainage and the loss of permanent pastures. Conversely, it has appeared in new sites on the edges of reservoirs. It is mapped as native in Ireland, but its status there is uncertain (Scannell & Synnott, 1987).
Eurosiberian Temperate element; widely naturalised outside its native range.
Count of 10km squares in Great Britain: 430
Count of 10km squares in Ireland: 4
Count of 10km squares in the Channel Isles: 1
Atlas Change Index: -1.09
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.