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In page Cuyamaca Rancho State Park:

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Cuyamaca's average elevation of nearly 5,000 feet (1,500 m) enables many conifers and broadleaf trees to exist; a rarity in xeric Southern California. The conifers include the white fir, incense cedar, Coulter pine, Jeffrey pine, sugar pine and ponderosa pine. The broadleaves include the white alder, Arizona ash, California sycamore, Fremont cottonwood, coast live oak, canyon live oak, Engelmann oak, California black oak, interior live oak, oracle oak, and red willow.[1]