[GRJoe]

Dear All, for some reason this plant doesn't want to reveal its name or origin to me. You probably know it, it thrives on rocky road-sides, e.g. on the Athens-Sounio drive. At first, I thought it is a Coronilla species, but no perfume. Attractive grey-green foliage. Height: ~1.5 m. Presence of stipules.

[oron peri]

Medicago arborea

[John J]

Joe, this is an excellent example of a summer dormant shrub. Mine looks completely dead during the heat of the summer, nothing but a collection of dry-looking sticks. So much so that the first year my wife wanted to pull it out as a failure. I told her to wait and as soon as the winter rains came it exploded into growth, first the fresh green foliage followed by a mass of yellow flowers. It's done that every year since and it takes being cut back to keep it in shape without any problems.

[GRJoe]

Thank you Oron! This makes it sound even more interesting (nitrogen fixing etc).
Dear John J, it sounds like the perfect dry climate plant no need for watering in summer. I am confident it has a deep taproot too. Ok, esthetically then it's not the best summer attraction 

[Alisdair]

Easily grown from seed, too (being sentimental, we collected seed from one that was growing in the Roman Agora in Athens - reached flowering size very quickly after planting out in the semi-wild part of our garden in the Peloponnese, watered monthly first summer then never).