A short, tufted, montane perennial herb of base-rich damp rocky or gravelly places, flushes and small marshes with little competing vegetation. It occupies the same habitats as the rarer J. biglumis, and often grows near or with it, but is less restricted to high altitudes, descending from 1065 m on Snowdon (Caerns.) to, formerly, 60 m in Shetland.
J. triglumis was lost from Orkney and Shetland before 1930. The overall distribution elsewhere has changed little since the 1962 Atlas, and it is probably still present in those squares where it has not been seen since 1987.
Circumpolar Arctic-montane element.
Count of 10km squares in Great Britain: 200
Count of 10km squares in Ireland: 0
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -0.38
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.