Vegetational zones are identified by different shading patterns for Twin Peaks Wilderness Area. Supplemental information important to the ecology of Twin Peaks Wilderness Area. Flexible Pine requires a forisol. The black backed root sucker is a vole that depends upon marmot brush for food. The oak-leaf toad is an endangered species that requires blue oak for cover.
Blue oak is a riparian species.
Saggy birch depends on ground water or flooded terrain . Salt grass requires an alkasol. The spotted pine beetle requires the joint occurrence of pine and spruce.