A perennial herb of relatively infertile, dry but not droughted soils in open woods, woodland margins, scrub, grassy hedge banks and rock crevices; also occasionally in meadows and on walls. In the lowlands it is usually found in partially shaded sites but it extends into open habitats in upland areas. 0-790 m (Helvellyn, Cumberland).
There is no change in the distribution of P. sterilis since the 1962 Atlas.
Suboceanic Temperate element; also in N. America.
Light (Ellenberg): 5
Moisture (Ellenberg): 5
Reaction (Ellenberg): 5
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.6
July Mean Temperature (Celsius): 14.7
Annual Precipitation (mm): 1071
Height (cm): 15
Perennation - primary
Life Form - primary
Clonality - primary
Comment on Clonality
Count of 10km squares in Great Britain: 2167
Count of 10km squares in Ireland: 742
Count of 10km squares in the Channel Isles: 8
Atlas Change Index: -0.3
Weighted Changed Factor: -16
Weighted Change Factor Confidence (90%)
Atlas text references
1962. La flore atlantique européenne. Documents pour les cartes des productions végétales serie Europe-Atlantique, vol. 1.
Grime at al (1988)
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.