I shot a few pics of Ferocactus in the Kingston Mts in 2005. Unfortunately I was passing through pretty quick and didn't leave a lot of time to look around. I was surprised to encounter them that far north. Even more surprised to read of them (in this thread) in the Panamint Range. It will probably be years before I can return to SoCal for plant hunting or else I would ask where to find them.
I was also surprised to find Ferocactus in Peach Springs, AZ.
monster Nolina, Kingston Mts