Thank you for suggestion Dan, I have been trying to identify the plant with a friend and we have found that probably is a Linaria aeruginosa. It is an endemism of the Iberian peninsula.
In this link the photo is like mine and the plant is identified like Linaria aeruginosa:
http://365plantas.blogspot.com/2008/06/linaria-aeruginea-subsp-aeruginea.html
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