Here the Sierra Nevada Foothills are defined as more or less coinciding with the Ponderosa Pine-dominated forests on the western slope of the Sierra Nevada Mountains. Elevations of this zone vary, depending on the latitude:
- NORTH: 1200-5500 feet
- CENTRAL: 2000-6500 feet
- SOUTH: 2500-9000 feet
Note that Jim studied just east of Placerville, mostly between 2600-4500 feet in
elevation, so species appearing only above and below those elevations were not encountered. For
example, just below Jim's elevation Blue Oak was abundant, but Jim never saw a single Blue Oak tree during his hikes.
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