Ranunculus omiophyllus
Tracheophyta
›Magnoliopsida›Ranunculaceae›Ranunculus›Ranunculus omiophyllus
Ecology
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.).
Status
Native
Trends
R. omiophyllus remains frequent in W. Britain and S. Ireland, where there are many more records than there were in the 1962 Atlas. The decline at the fringes of its range was already discernible in the 1962 Atlas, and is now much more marked.
World Distribution
Suboceanic Southern-temperate element.
© Shannon, P
vc58, Lyme Park
© 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
Height (cm): 9
Length: 25
Perennation - primary
Annual
Perennation - secondary
Perennial
Life Form - primary
Annual hydrophyte (aquatic therophyte)
Life Form - secondary
Perennial hydrophyte (perennial water plant)
Woodiness
Herbaceous
Clonality - primary
Little or no vegetative spread
Clonality - secondary
Extensively creeping and rooting at nodes
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%)
27
JNCC Designations
NBNSYS0000002723
Atlas text references
Atlas (23a)
Jalas & Suominen (1989)
.
1997. Aquatic plants in Britain and Ireland.
Comment on Life Form