Persicaria hydropiper
Ecology
An annual of damp mud on the margins of ponds and lakes, canals, rivers and streams, or shallow depressions such as vehicle tracks and hoof-marks in woodland rides, around field gateways and in wet meadows. It is almost invariably in sites which are waterlogged in winter, often on base-poor soils and sometimes in partial shade. 0-505 m (Llyn Crugnant, Cards.).
Status
Trends
The distribution of P. hydropiper has not changed markedly since the 1962 Atlas, although there have been losses at the eastern edge of its range.
World Distribution
Circumpolar Temperate element; widely naturalised outside its native range.
Broad Habitats
Light (Ellenberg): 7
Moisture (Ellenberg): 7
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 6
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.7
July Mean Temperature (Celsius): 14.8
Annual Precipitation (mm): 1093
Height (cm): 75
Perennation - primary
Life Form - primary
Woodiness
Clonality - primary
Count of 10km squares in Great Britain: 2041
Count of 10km squares in Ireland: 740
Count of 10km squares in the Channel Isles: 9
Atlas Change Index: -0.41
Weighted Changed Factor: -3
Weighted Change Factor Confidence (90%)
JNCC Designations
Atlas text references
Atlas (175c)
.
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.
.
1966. Biological Flora of the British Isles. No. 103. Polygonum hydropiper L. Journal of Ecology. 54:815-821.