A stoloniferous perennial of still, shallow, base-rich, clear and not eutrophicated water bodies, including ponds, ditches, ox-bows and backwaters. It can withstand shade and temporary exposure. It is heterostylous, requiring crosses between pins and thrums to set seed; vegetative growth often produces single-morph colonies that set little seed. Lowland.
Many colonies of H. palustris have been lost to drainage, vegetation clearance, eutrophication, boat traffic and trampling by cattle. Most of these losses occurred before 1930, but have continued, particularly in S.E. England.
European Temperate element.
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Light (Ellenberg): 7
Moisture (Ellenberg): 11
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.6
July Mean Temperature (Celsius): 16
Annual Precipitation (mm): 697
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 463
Count of 10km squares in Ireland: 2
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -0.63
Atlas text references
1989. On the lifecycle and germination of Hottonia palustris L. in a wetland forest. Aquatic Botany. 35:153-166.
1988. The Irish Red Data Book. 1. Vascular Plants.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1978. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.
1997. Aquatic plants in Britain and Ireland.