Proteas - heat tolerance

Does anyone if Proteas, Banksias, and Grevillias can tolerate dessert heat (with some shade at the hottest times)?
I have a friend in Palm Springs, Californai, that was wondering if they would survive there.  I believe it gets up to about 43 degrees there on summer days.  I have read that they don't like summer watering, but some summer water would be essential in such a climate. Anyone grow them in southern California or in a dessert setting?
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