S. silaus is found in damp, unimproved neutral grassland, usually on clay soils. Its habitats include hay- and water-meadows, species-rich pastures and roadsides; it is occasionally found on chalk downs, railway banks and vegetated shingle. Lowland.
The 1962 Atlas indicated little change in the distribution of S. silaus before 1930. Since the 1962 Atlas there is evidence of a small but distinct decline throughout its range, e.g. in Somerset (Green et al., 1997) and Oxfordshire (Killick et al., 1998).
Eurosiberian Temperate element.
Light (Ellenberg): 8
Moisture (Ellenberg): 5
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 4
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.6
July Mean Temperature (Celsius): 15.8
Annual Precipitation (mm): 743
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 of north European vascular plants north of the Tropic of Cancer. 3 vols,
, Königstein, (1986)
Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols,
, Jena, (1978)
Umbellifers of the British Isles. Botanical Society of the British Isles Handbook no. 2,
, London, (1980)