A short, tufted perennial herb, usually found on base-rich substrates and less frequently in acidic conditions. It grows on wet rocks, consolidated screes, in grassland and in damp flushes in the mountains, and it is often abundant in montane pastures. Reproduction is mostly by bulbils at the base of the inflorescence, frequently carried down to lower levels by streams. It reaches 1210 m on Ben Lawers (Mid Perth), but descends to near sea level in N. Scotland.
There has been little change in the distribution of this species since the 1962 Atlas.
Circumpolar Boreo-arctic Montane element.
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Light (Ellenberg): 8
Moisture (Ellenberg): 6
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 1.6
July Mean Temperature (Celsius): 12.2
Annual Precipitation (mm): 1588
Height (cm): 30
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 446
Count of 10km squares in Ireland: 5
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -0.58
Weighted Changed Factor: -20
Weighted Change Factor Confidence (90%)
Atlas text references
1988. The Irish Red Data Book. 1. Vascular Plants.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1979)
1981. Docks and knotweeds of the British Isles. Botanical Society of the British Isles Handbook no. 3.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.