Ranunculus omiophyllus

Tracheophyta MagnoliopsidaRanunculaceaeRanunculusRanunculus omiophyllus


A small annual or short-lived perennial which grows in shallow water or on wet soil. Typical sites include the margins of ponds and ditches, flushes, damp depressions, gateways and tracks in pastures and on heathland, and the sheltered backwaters of rivers. Unlike R. hederaceus, it is confined to acidic, mesotrophic or oligotrophic soils. 0-1005 m (Carnedd Llewelyn, Caerns.).



World Distribution

Suboceanic Southern-temperate element.

© Shannon, P

Broad Habitats

Fen, marsh and swamp (not wooded)

Light (Ellenberg): 7

Moisture (Ellenberg): 10

Reaction (Ellenberg): 5

Nitrogen (Ellenberg): 4


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.7

July Mean Temperature (Celsius): 14.7

Annual Precipitation (mm): 1180

Life form information

Height (cm): 9

Length: 25

Perennation - primary


Perennation - secondary


Life Form - primary

Annual hydrophyte (aquatic therophyte)

Life Form - secondary

Perennial hydrophyte (perennial water plant)

Comment on Life Form

Normally annual but occasionally perennates (P & C 1994)



Clonality - primary

Little or no vegetative spread

Clonality - secondary

Extensively creeping and rooting at nodes

Distribution information

Count of 10km squares in Great Britain: 813

Count of 10km squares in Ireland: 151

Count of 10km squares in the Channel Isles: 1

Atlas Change Index: 0.52

Weighted Changed Factor: 7

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 (23a)
Jalas & Suominen (1989)
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.