Myriophyllum aquaticum

Tracheophyta MagnoliopsidaHaloragaceaeMyriophyllumMyriophyllum aquaticum


This perennial often grows in emergent masses in small, sheltered, eutrophic water bodies, especially ponds and ditches but also reservoirs, canals and flooded mineral workings. Only female plants are known in Britain and they spread clonally by vegetative fragmentation. Lowland.



World Distribution

Native of central S. America; female plants are now widely naturalised in warm temperate and tropical areas elsewhere.

Broad Habitats

Standing water and canals

Light (Ellenberg): 7

Moisture (Ellenberg): 12

Reaction (Ellenberg): 5

Nitrogen (Ellenberg): 3


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 4.3

July Mean Temperature (Celsius): 16.1

Annual Precipitation (mm): 838

Length: 200

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Irregularly fragmenting (mainly water plants)

Count of 10km squares in Great Britain: 268

Count of 10km squares in Ireland: 2

Count of 10km squares in the Channel Isles: 7

Distribution information

JNCC Designations


PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.

Atlas text references

Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.