Myriophyllum spicatum

Tracheophyta MagnoliopsidaHaloragaceaeMyriophyllumMyriophyllum spicatum


This species grows in a wide range of meso-eutrophic or eutrophic and often calcareous waters. These include lakes, ponds, rivers, canals and ditches. It may persist in managed ditches and rivers and colonises newly flooded mineral workings. It also grows in slightly brackish sites. 0-390 m (Drumore Loch, E. Perth).



World Distribution

Eurasian Temperate element, but naturalised in N. America so distribution is now Circumpolar Temperate.

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 12

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 7


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.7

July Mean Temperature (Celsius): 15.1

Annual Precipitation (mm): 907

Length: 250

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Irregularly fragmenting (mainly water plants)

Distribution information

Count of 10km squares in Great Britain: 1409

Count of 10km squares in Ireland: 373

Count of 10km squares in the Channel Isles: 7

Atlas Change Index: 0.63

Weighted Changed Factor: 10

Weighted Change Factor Confidence (90%)


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

Atlas (150a)
Aiken SG, Newroth PR, Wile I
1979.  The biology of Canadian weeds. 34. Myriophyllum spicatum L. Canadian Journal of Plant Science. 59:201-215.
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Meusel H, Jäger E, Rauschert S, Weinert E
1978.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.