I'm surprised that though the forum is now four months old, with lots of activity, nobody has yet said much about cistuses and similar plants - such a wide range of drought-hardy plants, with such abundant and often showy flowers, and often the bonus of tremendous fragrance from their foliage, so evocative of Mediterranean summers.
Just to start the ball rolling, click
here for Pamela's photo of
Cistus x
skanbergii, one of the easiest, tolerant of a wide range of alkalinity.