An annual or biennial, found in rough pasture, on grassy banks, in hedgerows and on waste ground. It is locally well-established and persistent, especially in coastal habitats in S. England, but is also a widespread casual. Lowland.
S. marianum occurs as an introduction with wool shoddy, bird-, grass- and oil-seed, and as a garden escape. The large number of pre-1987 records is unlikely to reflect a decline in this species, but rather it represents the accumulation of casual records over many years.
Native of the Mediterranean region; naturalised or casual throughout much of Europe and in N. America and Australia.
Light (Ellenberg): 8
Moisture (Ellenberg): 4
Reaction (Ellenberg): 8
Nitrogen (Ellenberg): 6
Salt Tolerance (Ellenberg): 1
January Mean Temperature (Celsius): 4
July Mean Temperature (Celsius): 15.8
Annual Precipitation (mm): 781
Height (cm): 100
Perennation - primary
Perennation - secondary
Life Form - primary
Life Form - secondary
Comment on Life Form
Clonality - primary
Count of 10km squares in Great Britain: 552
Count of 10km squares in Ireland: 64
Count of 10km squares in the Channel Isles: 6
Atlas Change Index: -0.07
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.