This subregion includes all the mountains south of the Transverse Ranges and features oak woodlands at low elevation–with Engelmann oak, coast live oak, California black oak, and canyon live oak–and extensive coniferous forests at higher elevations that include Jeffrey pine, Coulter pine, white fir, incense-cedar, and sugar pine.
• Native bark beetles including Ips, Scolytus, and Dendroctonus species
• Heterobasidion root disease
• Goldspotted oak borer
• Douglas-fir tussock moth