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• root sprouts of very few or even a single individual. <br />Plant SQecies Frecuency~rd Dens~y Measurements <br />During the course of cover sampling, all plant species occurring within one meter on either side of the <br />cover transact ware noted as a part on the cover data sheets. Frequency for each plant species <br />observed during sampling was calculated by dividing the number of 2x50 m sample plots in which the <br />species was observed by the total number of sample plots. As such, this value may be more correctly <br />termed 'constancy.' Relative vegetation cover was calculated by dividing the absolute cover of each <br />species by the total vegetation cover and expressing the result as a percent. <br />The total number of species (within each lifetorm) observed in each sample provide a measure of <br />'species density', in the units of number o1 species per 100 sq. m. These measures provide an <br />indication of relative species richness. <br />PlantySpecies Listing <br />• During the course of the Tield work, a list of all encountered plant species (quantitatively plus <br />incidental observations) was compiled. Scientific names used follow Weber and Johnston (1979); <br />common names cited may be found in Beetle (1970), Nickerson et al. (1976), or SCS (1979). Cross <br />reference to the substantially revised scientific nomenclature for the flora of Western Colorado, as set <br />forth by Weber (1987), may be determined by reference to Wittman et al. (1988). Of plant species <br />observed, only Canada thistle (Cirsium arvense), and common bindweed (Convolvulus arvensisj are <br />listed state-wide as noxious weeds (Thornton et al. 1974). Blue lettuce (Lactuca pulchella) and <br />pennycress (Thlaspi arvense), both restricted noxious weeds in Colorado (Thornton et al. 1974), are <br />also sparingly present at some locations. <br />PhoLograohic Documentation <br />Within each vegetation type, representative color photographs were taken to document the appearance <br />of the vegetation in 1990. Within each photo (unless it is along-distance view), a placard identities the <br />particular photo location, which are indicated on Exhibit 10.1. <br /> <br />3 <br />