Growing on the tufa scree with roots into a well-drained substrate is Chaenorhinum origanifolium. This perennial from Southern Europe is flowering well into autumn from a summer start. The clumps of trailing shoots are covered in small purple, white marked, flowers.
The corolla has the typical open mouth of the Toadflax and Snapdragons, all in the family Scrophulariaceae. Or as we should now call it: Plantaginaceae when following the Angiosperm Phylogeny Group III (APG) system of classification.