Damasonium alisma

Ecology

This annual grows on acidic mud by small ponds where the habitat is kept open by fluctuating water levels and disturbance by grazing animals. Its sites are usually flooded in winter but may be wet or dry in summer. The seeds appear to persist in a long-lived seed bank. Lowland.

Status

Native

World Distribution

Mediterranean-Atlantic element.

Broad Habitats

Standing water and canals

Light (Ellenberg): 8

Moisture (Ellenberg): 10

Reaction (Ellenberg): 5

Nitrogen (Ellenberg): 3

0

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.9

July Mean Temperature (Celsius): 16.5

Annual Precipitation (mm): 707

Life form information

Height (cm): 30

Perennation - primary

Annual

Life Form - primary

Annual hydrophyte (aquatic therophyte)

Woodiness

Herbaceous

Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 54

Count of 10km squares in Ireland: 0

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: -0.52

Distribution information

Plantatt Conservation Status

Endangered

JNCC Designations

NHMSYS0000457989

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 (301d)
Britain's rare flowers,
Marren, P. R.
, London, (1999)

Aquatic plants in Britain and Ireland,
Preston, C. D., and Croft J. M.
, Colchester, (1997)

British Red Data Books. 1. Vascular plants, edn 3,
Wigginton, M. J.
, Peterborough, (1999)