Crocus angustifolius x flavus (C. x stellaris)
A cormous perennial herb of churchyards, roadsides, parks and other amenity grasslands. It is often long-lived when discarded into suitable habitats, where it spreads vegetatively. Lowland.
C. x stellaris is commonly grown in gardens as the sterile cultivar `Golden Yellow` (also known as `Dutch Yellow` or `Yellow Giant`). This cultivar was raised over two hundred years ago and its parent species have been cultivated in Britain since the 16th century. C. x stellaris was first recorded in the wild in 1848. It appears to be steadily increasing, but it has been confused with other taxa, especially cultivars of its parent species and of C. chrysanthus, making changes in distribution difficult to assess.
A hybrid of garden origin.
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.