Ensatina eschscholtzi oregonensis
Oregonensis is found as far north as S. Bentinck Arm and Kitlope R. in SW British Columbia (not shown on this map).
Westward and southwestward, oregonensis intergrades with the subspecies picta.
Southward from Oregon, oregonenis intergrades with xanthoptica. The range extends to the Russian River near Healdsburg, Glen Ellen and Napa, and further southward to Santa Cruz where it abruptly intergrades with the subspecies xanthoptica, points of incipient species formation.
Southeastward from Oregon, oregonensis intergrades with platensis. The range extends to Mount Lassen where it abruptly intergrades with the subspecies platensis, another point of incipient species formation.