Alisma plantago-aquatica
Tracheophyta
›Magnoliopsida›Alismataceae›Alisma›Alisma plantago-aquatica
Ecology
A perennial herb growing on exposed mud at the shallow edge of still or slow-flowing waters, or in marshes and swamps. It is confined to mesotrophic or eutrophic habitats. Plants fruit prolifically, and the species is a frequent colonist of newly cleaned ditches and recently flooded mineral workings. Generally lowland, but reaching 405 m at Dock Tarn (Cumberland).
Status
Native
Trends
A well-recorded species with a distribution which is similar to that in the 1962 Atlas.
World Distribution
Circumpolar Wide-temperate element; widely naturalised outside its native range.
© G. Toone, IWNHAS
Cridmore
© G. Toone, IWNHAS
Cridmore
© G. Toone, IWNHAS
Broad Habitats
Light (Ellenberg): 7
Moisture (Ellenberg): 10
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 7
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.8
July Mean Temperature (Celsius): 15.2
Annual Precipitation (mm): 950
Height (cm): 100
Length: 50
Perennation - primary
Perennial
Life Form - primary
Perennial hydrophyte (perennial water plant)
Woodiness
Herbaceous
Clonality - primary
Little or no vegetative spread
Count of 10km squares in Great Britain: 1761
Count of 10km squares in Ireland: 624
Count of 10km squares in the Channel Isles: 8
Atlas Change Index: -0.19
Weighted Changed Factor: -6
Weighted Change Factor Confidence (90%)
19
JNCC Designations
NBNSYS0000002101
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