Carex elongata

Tracheophyta MagnoliopsidaCyperaceaeCarexCarex elongata

Ecology

A perennial herb of wet woodlands, especially those dominated by Alnus and those on lake shores, but also found on pond margins, in ditches and seasonally flooded areas, and in wet meadows. In favourable conditions it can form large, loose tussocks and it sets seed freely in more open situations. Lowland.

Status

Native

World Distribution

Eurosiberian Boreal-montane element, with a continental distribution in W. Europe.

Broad Habitats

Broadleaved, mixed and yew woodland

Light (Ellenberg): 5

Moisture (Ellenberg): 8

Reaction (Ellenberg): 6

Nitrogen (Ellenberg): 6

0

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.6

July Mean Temperature (Celsius): 15.5

Annual Precipitation (mm): 899

Life form information

Height (cm): 80

Perennation - primary

Perennial

Life Form - primary

Hemicryptophyte

Woodiness

Herbaceous

Clonality - primary

Tussock-forming graminoid, may slowly spread

Count of 10km squares in Great Britain: 72

Count of 10km squares in Ireland: 18

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: 0.06

Distribution information

JNCC Designations

NBNSYS0000002481

External Species Accounts

Scarce Atlas Account

Scarce Atlas Account: 

Carex elongata L.

Elongated sedge

Status: scarce

 

C. elongata is a plant of lowland ponds, canal sides and wet woods and is more rarely found beside lakes in occasionally flooded meadows. It cannot tolerate continuous swamp conditions and benefits from winter flooding and drying out in summer. A characteristic habitat is decaying alder or willow carr, where the plant is often epiphytic on fallen boughs that keep it above summer water level with its roots still wet. It also favours stagnant ditches in water-meadows, and canals where the ancient wooden camp-sheathing provides the kind of pedestal that it enjoys.

C. elongata is a perennial species. In suitable conditions and not too much shade it seeds freely, but one of the largest and most floriferous colonies in England at Askham Bog seldom sets viable seed (Fitter & Smith 1979). Individual tussocks may become substantial but soon decay if conditions are not right. The plant seems unable to colonise newly exposed mud either vegetatively (the rhizomes are very short) or by seed.

Reclamation of marshes, the rehabilitation of canals for recreation, especially that involving strengthening of the banks with metal sheathing, and the infilling of pits and ponds have greatly reduced or extinguished many populations. The early British records were mostly from canals in the Manchester area, where the sedge was abundant, but the whole area has been reclaimed and the sedge has now gone. In recent years fine colonies have been discovered in Wales and several around Loch Lomond.

In Europe this sedge reaches as far north as the subarctic zone in Norway and Russia but is not found south of central France and northern Spain and Italy. It extends eastward to the Caucasus.

For a detailed account of the British distribution, see David (1978b, 1982a).

 

R. W. David

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 (368c) Curtis TGF, McGough HN
1988.  The Irish Red Data Book. 1. Vascular Plants.
David (1978b) Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols. Jermy AC, Chater AO, David RW
1982.  Sedges of the British Isles. Botanical Society of the British Isles Handbook no. 1, edn 2. Meusel H, Jäger E, Weinert E
1965.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols. Stewart A, Pearman DA, Preston CD
1994.  Scarce plants in Britain.