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Examples
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Mojave desert species, such as blackbrush, Joshua tree, and cholla cactus, become more common in the east and south, where summer moisture is more prevalent.
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Xerophytic brush species, such as blackbrush, guajillo, and ceniza, are typical on the rocky, gravelly ridges and uplands.
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They are warmer than the soils of Ecoregion 13 and support creosote bush, Joshua tree, blackbrush, big sagebrush, and associated grasses.
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Elevations are lower and the climate is warmer than on the Edwards Plateau (30), and the vegetation, primarily blackbrush and honey mesquite, is more typical of the rest of the Southern Texas Plains (31).
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Saltbush-greasewood and blackbrush communities are common at lower elevations but are generally absent from the higher Arizona/New Mexico Plateau (22).
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Shifting sand is mostly devoid of vegetation while soils on stable sand blankets support drought-tolerant plants including Indian ricegrass, sand dropseed, yucca, and blackbrush.
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Open grassland with scattered low-growing brush, such as guajillo, blackbrush, elbowbush, and kidneywood, characterize shallower soils.
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The typical desert shrubs and grasses growing in these environments, such as creosotebush, tarbush, fourwing saltbush, blackbrush, gyp grama, and alkali sacaton, must withstand large diurnal ranges in temperature, low available moisture, and an extremely high evapotranspiration rate.
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However, the region also has large low-lying areas containing saltbush-greasewood communities, and in Utah, blackbrush communities typical of hotter, drier areas.
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Brushy species from adjacent dry uplands occur at the margins, such as honey mesquite, huisache, blackbrush, and lotebush, with some grasses such as multiflowered false rhodesgrass, sacaton, cottontop, and plains bristlegrass.
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