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Anacyclus valentinus
Anacyclus valentinus is the type species for the genus Anacyclus in the tribe Anthemideae and family Asteraceae.
Hard to find species, even though it is apparently fairly common in the part of Spain where you spotted it. Tip: Encyclopedia of Life's page on this organism is almost empty. Perhaps you can contribute some pictures to them as well. (http://eol.org/pages/6262816/overview) For science! ;)