Crithmum maritimum

Tracheophyta MagnoliopsidaUmbelliferaeCrithmumCrithmum maritimum


A fleshy perennial herb of spray-drenched rock crevices and ledges on sea-cliffs, coastal rocks and on stabilised shingle; also in maritime grassland and artificial habitats like harbour walls and stone sea defences. It appears indifferent to soil reaction, being found on many rock types from chalk and limestone to granite. Lowland.



World Distribution

Mediterranean-Atlantic element.

Broad Habitats

Supralittoral rock (does not include maritime grassland)

Light (Ellenberg): 9

Moisture (Ellenberg): 6

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 5


Salt Tolerance (Ellenberg): 5

January Mean Temperature (Celsius): 5.1

July Mean Temperature (Celsius): 15.4

Annual Precipitation (mm): 1042

Life form information

Height (cm): 45

Perennation - primary


Life Form - primary




Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 301

Count of 10km squares in Ireland: 138

Count of 10km squares in the Channel Isles: 14

Atlas Change Index: 0.23

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