Cooper, 1936 San Andreas, Calaveras Co., Calif. April 25 5. Quercus lobata + douglasii broad leaf oaks. 6. Rhus diversifolia poison oak. The country is pretty much the same as regards floral + faunal associations + zonation, as far south A least as Valley Spring (10 mi. from San Andreas), and as far north as Mountain Ranch, 12 mi. N E of San Andreas. At these places begins to Upper Sonoran give way to Lower Sonoran + Transition. At 2 mi. S/W of Mountain sugar pines and yellow pines were first noted. Made X census of a region about 3 mi. W of San Andreas and about 1/2 mi. from the N. Fork of Calaveras R. On the cooler north and east facing slopes, scrub oak (Q. wislizenii), digger pine, (some) poison oak and manzanita were the dominant perennials; wild oat was the dominant annual. On the south and west facing slopes, chaparel is dominant; very few annuals are present, and are on every instance where present. I worked over the north + east-facing slopes entirely. Jays would not be abundant in pure chaparrel stands! When larks (colubrinae) were heard calling from these slopes.