From the New York Times:
“Since the 1880s, there have been blue gum eucalyptus trees growing on San Francisco’s Mount Sutro, which lies just south of Golden Gate Park. Recently, the University of California, San Francisco, which owns most of Mount Sutro, has been trying to thin the dense eucalyptus forest. … But the effort to cull the Mount Sutro forest has been met with strident protest by residents who want to see the eucalyptus left untouched.
“By the standard of the California Native Plant Society, eucalyptus, which were brought from Australia, are officially nonnative trees because they were introduced after the first European contact with the New World.”