Olivier Filippi’s Nursery In France but export available to EU countries. The best collection of Cistus and Halimium commercially available anywhere. Very knowledgeable on their plants and how to grow them.
Angiosperm Phylogeny Website A website for the specialist, but with superb detailed photographs of cistus. Go to “Malvales”, then “Cistaceae” and click on the “Photos – Collection” link.