The US Fish and Wildlife 5-year review (USFW 2009) indicates that there are 3 populations in the US, occurring in 3 separate canyons, all on the north slope of Otay Mountain. The total number of individuals is roughly 6,000 individuals. The numbers appear stable, and in my opinion appear to be growing. In surveying I have seen many young trees and the populations seem to be doing well. That being said, they are all very localized, with all individuals occurring in roughly 11 square miles, and the threat of a single fire damaging all populations is great.