Common Rock Rose
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Helianthemum nummularium
Common & widespread in Britain.
It is an evergreen trailing plant with loose terminal clusters of bright yellow, saucer-shaped flowers.
In the flower centre is a tight cluster of orange stamens, which are sensitive to the touch, and spread outwards to reveal the tall stigma in the middle.
Seen from January-December.
Foodplant of the Brown Argus.