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• It should be noted that St_ ipa comata could not always be easily <br />separated from Stipa neoinexicana as these two species are vegetatively <br />very similar and occur in the same habitat (A'eber 1986). Positive <br />identification can be made when the awned seed are present. Most of the <br />Stlpa plants of the study area had already dropped their seed prior to <br />the study. Only Stipa comata was found in the reference area. Both <br />Stipas were found in the affected area, often nrowing together. <br />Therefore, in the data we report Stipa presence as Stipa spp. <br />2.6 Species Diversity <br />Species diversity was estimated for both <br />area by analyzing the cover data to <br />relative cover of 3 percent or grea <br />first-hit cover data. These species <br />life-form for both the affected and <br />comparative estimate of species richness <br />• 2.1 Time of Sampling <br />the affected area and reference <br />determine which plants had a <br />:e r. Estimates were based on <br />were then grouped by major <br />reference areas to provide a <br />and evenness of the two areas. <br />All quantitative cover, production and density data were collected <br />during the period July 7-11, 1986. <br /> <br />4 <br /> <br />