Schoenoplectus triqueter

Tracheophyta MagnoliopsidaCyperaceaeSchoenoplectusSchoenoplectus triqueter


This tussock-forming, rhizomatous perennial herb occurs on mud-banks along the lower reaches of tidal rivers, where it may become submerged at the highest tides. Lowland.



World Distribution

Eurasian Temperate element.

Broad Habitats

Rivers and streams

Light (Ellenberg): 8

Moisture (Ellenberg): 10

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 7


Salt Tolerance (Ellenberg): 3

January Mean Temperature (Celsius): 4.7

July Mean Temperature (Celsius): 16.5

Annual Precipitation (mm): 799

Life form information

Height (cm): 125

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Rhizome shortly creeping

Count of 10km squares in Great Britain: 8

Count of 10km squares in Ireland: 3

Count of 10km squares in the Channel Isles: 0

Distribution information

Plantatt Conservation Status

Critically endangered

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 (348c)
Curtis TGF, McGough HN
1988.  The Irish Red Data Book. 1. Vascular Plants.
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.
Wigginton MJ
1999.  British Red Data Books. 1. Vascular plants, edn 3.