A small, rosette-forming perennial herb of oligotrophic lakes with acidic substrates. It is slow-growing, with little ability to withstand shade or competition and is therefore confined to shallow water less than 2 metres deep. Reproduction and dispersal is by seed, which can remain viable for thirty years. 0–745 m (Llyn Bâch, Caerns.).
Native (change -0.05). L. dortmanna is still frequent in the north and west but has declined, largely before 1930, from the eastern edge of its range in both Britain and Ireland through eutrophication.
European Boreal-montane element; also in N. America.
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Weighted Changed Factor: -13
Weighted Change Factor Confidence (90%)
Atlas text references
1989. Biological Flora of the British Isles. No. 165. Lobelia dortmanna L. Journal of Ecology. 77:1161-1173.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1992. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 3. 2 vols.
1997. Aquatic plants in Britain and Ireland.