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• However, the ecological inventory did not verify these species to be present. <br />Likewise, none of the species listed by the Colorado Natural Heritage <br />Inventory (19801 as "plant species of special concern" have been observed <br />in the study area. <br />It should be noted that an additional field inventory will be conducted <br />early in the 1963 growing season to further determine the presence or <br />absence of threatened and endangered plants. <br />3.5 SPECIES DIVERSITY <br />Table 13 identifies by major life form for each study area all species <br />having a relative cover greater than 3 percent. Thus, the greasewood <br />study area has a species diversity of 5 composed of two shrubs, one peren- <br />nial grass, one perennial forb, and one annual forb. The Shadscale study <br />area has a species diversity of 2, being composed of one shrub and one <br />annual grass. The Greasewood/Shadscale study area has a species diversity <br />of 6 as it has two shrubs, one annual grass, and 3 annual forbs. It is <br />likely that, in the Greasewood/Shadscale study area at least, the reclama- <br />tion should be directed toward the establishment of more perennial grasses <br />and fewer or no annual forbs. <br />• 3.6 SAMPLE CHARACTERISTICS AND ADEQUACY <br />Table 14 provides data on the adequacy of cover, production, and <br />shrub density sampling. A statistically adequate number of cover samples <br />was taken in all study areas. For production the maximum number of plots <br />150) was clipped in all study areas. Sample adequacy, however, was <br />achieved for the Shadscale shrubland. The maximum number of density <br />quadrats 1251 was taken in all study areas. <br /> <br />-12- <br />