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Arizona Upland/Eastern Sonoran Mountains

Ecoregion in Sonoran Desert in AZ, CA

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The Arizona Upland/Eastern Sonoran Mountains are highland areas that have more rainfall (7 to 20 inches annually) than the Sonoran Desert mountains further west (ecoregions 81a, 81i) and with greater amounts in summer. It is one of the highest and coldest parts of the Sonoran Desert, with elevations ranging from about 1500 to over 4500 feet. Vegetation includes saguaro, foothill paloverde, creosotebush, triangle bursage, limberbush, wolfberry, bush muhly, threeawns, pricklypear, cholla, ocotillo, organpipe cactus, ironwood, and globe mallow. It supports a rich birdlife. The soil temperature regime here is thermic, compared to the hyperthermic soils of Ecoregion 81i.

— EPA

Plants

Saguaro Carnegiea gigantea (species), “Arizona Giant Cactus”

Arizona Upland/Eastern Sonoran Mountains

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