Sagebrush scrub

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Sagebrush scrub is a vegetation type (biome) of mid-to-high elevation Western United States deserts characterized by low-growing drought-resistant shrubs including the sagebrush ( Artemisia tridentata ) and its associates. [1] [2] It is the dominant vegetation type of the Great Basin Desert (Great Basin shrub steppe), [2] occurs along the margins of the Mojave Desert, including in the southern slopes of the Sierra Nevada and the Transverse Ranges, in California, [2] and occurs in the Colorado Plateau and in the Canyonlands, where it may be referred to as cool desert shrub. [3]

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It often occurs adjacent to piñon-juniper woodland communities, between 4,000 and 7,000 feet elevation, where annual precipitation is 8"-15", much of it snow. [4]

It sometimes occurs in pure stands of sagebrush or with associates that vary from region to region. [2] Sagebrush scrub may occur as an understory of pinyon-juniper woodland. [2]

Mojave Desert

In the Mojave Desert, sagebrush associates include saltbrush ( Atriplex spp. ), rubber rabbitbrush ( Ericameria nauseosa ), green ephedra ( Ephedra vidris ), hop-sage ( Grayia spinosa ), and bitterbrush ( Purshia glandulosa ). [2]

Sierra Nevada

Sagebrush scrub occurs in relatively deep soils along the Sierra-Cascade axis, running from Modoc County to San Bernardino County. [4]

In the Sierra Nevada range, in California, sagebrush associates include bitterbrush ( Purshia tridentata ), curl-leaf mountain-mahogany ( Cercocarpus ledifolius ), and rabbitbrushes ( Chrysothamnus spp., Ericameria spp.). [1] Average summer temperatures are in the 80's Fahrenheit, and 10-20 degrees F in the winter. [1] It can survive on 7 inches of annual precipitation and so is generally below the piñon-juniper woodland vegetation type, which requires 12 to 20 inches. [1] Its range is 4,200 to 7,000 feet in the eastern Sierra Nevada range, in California. [1]

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References

  1. 1 2 3 4 5 Karen Wiese, Sierra Nevada Wildflowers, 2013, p. 18-19
  2. 1 2 3 4 5 6 Pam Mackay, Mojave Desert Wildflowers, p19
  3. Damian Fagan, Canyon Country Wildflowers, p3
  4. 1 2 Introduction to California Plant Life, RObert Ornduff, Phyllis M. Faber, Todd Keeler-Wolf, revised ed., 2003, p. 213-214