Apium nodiflorum

Tracheophyta MagnoliopsidaApiaceaeApiumApium nodiflorum


A perennial herb, found in shallow water in streams, ditches, swamps and marshes, and on seasonally exposed mud at the edges of ponds, lakes, rivers and canals, sometimes scrambling into nearby vegetation. It is characteristic of nutrient-enriched sites. Generally lowland, but reaching 335 m E. of Shap (Westmorland).



World Distribution

Eurosiberian Southern-temperate element; widely naturalised outside its native range.

© K.J. Walker, BSBI

Broad Habitats

Rivers and streams

Light (Ellenberg): 7

Moisture (Ellenberg): 10

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 7


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 4

July Mean Temperature (Celsius): 15.2

Annual Precipitation (mm): 961

Life form information

Height (cm): 60

Length: 100

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: 1661

Count of 10km squares in Ireland: 855

Count of 10km squares in the Channel Isles: 12

Atlas Change Index: -0.31

Weighted Changed Factor: 14

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 (158d)
Grime JP, Hodgson JG, Hunt R
1988.  Comparative Plant Ecology.
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.
Tutin TG
1980.  Umbellifers of the British Isles. Botanical Society of the British Isles Handbook no. 2.