Geranium rotundifolium
Ecology
An annual of hedgerows, dry roadside-banks and wall-tops, especially close to the sea, but spreading to roadside verges, rubble heaps, railway ballast and waste ground. It is also a garden and street weed. Colonies may be very persistent, even where the species is confined to weedy habitats. Lowland.
Status
Trends
G. rotundifolium has increased markedly since the 1962 Atlas. As a presumed native it is restricted to S. Britain and the extreme south of Ireland. However, given its spread in parts of S. England, it is possible that some recent, supposedly alien, records to the north of this could in fact represent a natural extension of its native range.
World Distribution
Eurosiberian Southern-temperate element; widely naturalised outside its native range.
Broad Habitats
Light (Ellenberg): 7
Moisture (Ellenberg): 4
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 6
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 4.2
July Mean Temperature (Celsius): 16.2
Annual Precipitation (mm): 810
Height (cm): 40
Perennation - primary
Life Form - primary
Woodiness
Clonality - primary
Count of 10km squares in Great Britain: 446
Count of 10km squares in Ireland: 25
Count of 10km squares in the Channel Isles: 9
Atlas Change Index: 1.7
Weighted Changed Factor: 65
Weighted Change Factor Confidence (90%)
JNCC Designations
Atlas text references
Atlas (93a)
.
1988. The Irish Red Data Book. 1. Vascular Plants.
.
1978. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.