A bulbous perennial herb, spreading by ant-dispersed seed on roadsides, in hedge banks, on field margins and in rough and waste ground. Lowland.
A. triquetrum was introduced into cultivation by 1759 and noted as established here by 1849, initially in Guernsey. It is now thoroughly naturalised and increasingly abundant and widespread in milder areas with scattered, sometimes short-lived, populations elsewhere. It has considerably increased in numbers and range since it was mapped in the 1962 Atlas.
Native of the W. & C. Mediterranean region.
Light (Ellenberg): 6
Moisture (Ellenberg): 4
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 4.9
July Mean Temperature (Celsius): 15.7
Annual Precipitation (mm): 956
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