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favor its growth. The canopy cover produced by this species <br />ranges from a low of about 25 percent to a high of about 75 <br />percent. The amount of cover increases with decreasing slope <br />which produces a change in the moisture regime toward slightly <br />more mesic conditions as well as a tendency toward a deeper <br />although not necessarily finer soil. <br />Understory species tend to vary in density and cover <br />according to the relationship to the two factors that primarily <br />control canopy cover for 115ountain Pahogany. The cover of the <br />understory ranges from about 20 percent to about 80 percent in <br />isolated, very favorable sites. <br />The primary species in the understory is Blue Grama <br />(Bouteloua gracilis). Other species of some importance include <br />Western Wheatgrass (Agropyron smithii), Prickly Pear Cactus <br />(Cpuntia sp.), and Fringed Sage (Artemisia frigida). Other <br />species noted include Stipa comata, Rose woodsii, Antennaria <br />sp., Bromus tectorum, Verbascum thapsus, Aster sp., Yucca glauea, <br />and Koeleria cristata. This list includes probably about 75 <br />percent of the species and at least SO percent of the cover. <br />Isolated individuals of Ponderosa Pine and Rocky ~7ountain <br />Juniper are sparsely scattered throughout the Mountain Mahogany <br />Community. As would be expected, the Ponderosa is found on <br />rockier, thinner soils than usually occurs in the community. On <br />the other hand, the Juniper is found on heavier soils than is <br />normnl for the coer;unity. local variations in tl:e understor are <br />31 <br />