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Yes, I do have another picture...
From Bonnier's book, Helianthemum Alyssoides = Halmium Alyssoides ç8called by C.Koch). The number of sepals is here 3.
H. Nummularium, according to Wikipedia , doesn't stands like an herb (like this one) and the leaves should be more green-light (green-white). So apparently it doesn't fit to this description
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