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Thick leaves, white underside of leaves, and flower shape (more or less erect petals) suggest P. crassifolium, but not white flowers. Does this species have any cultivar with white flowers or is this a different species?
the flowers look similar to P. coriaceum. I did a search on wiki and it said it is being threatened by habit loss and restricted to Canary Island. I don't know how it made it to SF, CA.