Isolepis setacea

Tracheophyta MagnoliopsidaCyperaceaeIsolepisIsolepis setacea


A perennial herb of open, damp, generally acidic sites, especially those subject to winter flooding. It occurs on sandy or gravelly tracks, on the shores of lakes or ponds, in short grassland, on eroding streamsides and occasionally on the coast in sand dunes or in turf in the upper zones of saltmarshes. 0-590 m (High Cup Nick, Westmorland).



World Distribution

Eurosiberian Temperate element; widely naturalised outside its native range.

© P. Shannon

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 9

Reaction (Ellenberg): 5

Nitrogen (Ellenberg): 3


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 14.4

Annual Precipitation (mm): 1149

Life form information

Height (cm): 15

Perennation - primary


Perennation - secondary


Life Form - primary

Therophyte (annual land plant)

Life Form - secondary


Comment on Life Form

Chris Preston doubts whether normally annual



Clonality - primary

Little or no vegetative spread

Distribution information

Count of 10km squares in Great Britain: 2038

Count of 10km squares in Ireland: 638

Count of 10km squares in the Channel Isles: 10

Atlas Change Index: 0.53

Weighted Changed Factor: 6

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