A short-lived perennial herb occurring at low elevations in ungrazed or lightly grazed saltmarshes, especially along creeksides, and also on muddy sea-banks, tidal river banks and in brackish ditches. In W. Britain and Ireland it also grows amongst rocks and on exposed sea-cliffs. It also occurs very locally in inland saltmarshes and recently it has been recorded beside salt-treated roads. Lowland.
The distribution of A. tripolium has not appreciably changed since the 1962 Atlas. The rayless form, var. discoideus, was mapped by Perring & Sell (1968).
Eurasian Temperate element.
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Light (Ellenberg): 9
Moisture (Ellenberg): 8
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 6
Salt Tolerance (Ellenberg): 5
January Mean Temperature (Celsius): 4.3
July Mean Temperature (Celsius): 14.8
Annual Precipitation (mm): 1109
Height (cm): 100
Perennation - primary
Life Form - primary
Comment on Life Form
Clonality - primary
Count of 10km squares in Great Britain: 703
Count of 10km squares in Ireland: 267
Count of 10km squares in the Channel Isles: 3
Atlas Change Index: -0.44
Weighted Changed Factor: 8
Weighted Change Factor Confidence (90%)
Atlas text references
Atlas Supp (72b)
1942. Biological Flora of the British Isles. No. 8. Aster tripolium L. Journal of Ecology. 30:385-395.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1977. The vegetation of British inland salt marshes. Journal of Ecology. 65:673-698.
1992. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 3. 2 vols.