Ranunculus fluitans

Tracheophyta MagnoliopsidaRanunculaceaeRanunculusRanunculus fluitans


This is a perennial species which grows in large, rapidly flowing rivers with a stable substrate. It is usually found in base-rich and meso-eutrophic water. In Ireland, it is confined to a single, now locally highly polluted, river. Lowland.



World Distribution

European Temperate element.

Broad Habitats

Rivers and streams

Light (Ellenberg): 7

Moisture (Ellenberg): 12

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 6

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.3

July Mean Temperature (Celsius): 15.4

Annual Precipitation (mm): 798

Length: 300

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Irregularly fragmenting (mainly water plants)

Clonality - secondary

Extensively creeping and rooting at nodes

Count of 10km squares in Great Britain: 373

Count of 10km squares in Ireland: 3

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: 1.96

JNCC Designations


Atlas text references

Atlas (23c)
Curtis TGF, McGough HN
1988.  The Irish Red Data Book. 1. Vascular Plants.
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1989)
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.