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<br /> <br />w <br />~ <br />CD <br />~ <br /> <br />9. Atriplex nuttallii. <br /> <br />The community is associated with the sandy alluvial material on level <br />areas and on low pediments. The dominant species are Atrip1ex nut- <br />ta11ii, Oryzopsis hymenoides, Opuntia po1ycnatha, Halogeton glomer- <br />atus, Gutierrezia sarothrae, Stanleya pinnata, and Sphaeralcea <br />grossular11tol1a. <br /> <br />10. <br /> <br />Atrip1ex confertifo1ia/Oryzopsis hymenoides. <br /> <br />This community occurs on the higher pediments with coarse textured <br />soils derived from the outwash from the Mesa Verde sandstone. Sand- <br />stone rocks and boulders comprise 33.0% of the ground cover. The <br />dominant species are Atrip1ex confertifo1ia, Oryzopsis hymenoides, and <br />Hilaria Jamesii. <br /> <br />11. Atrip1ex canescens/Oryzopsis hymenoides. <br /> <br />The community occurs in small areas on the edges of eroded pediment <br />slopes on the western end of the plateaus. The dominant species are <br />Atri1p1ex canescens, Orysopsis hymenoides, Hilaria jamesii, and <br />Ephedra torreyana. <br /> <br />The successional status of the plant communities is poorly known. The <br />communities on the steepest slopes apparently are serial stages and that is <br />related to the erodabi1ity of the landscape at that point. <br /> <br />16 <br />