The pics were taken a week ago, and the plant has a strong (to me) unpleasant smell, but the flowers are interesting. Sorry for the poor quality of the second photo.
You may be right, Growin. I'll have to go back to the garden where I cut that little sample and look at the flowers more attentively. Then I'll tell you my conclusion.
You're both right: Plectranthus neochilus.
Thank you very much.