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• (orbs, Introduced annual and biennial forbs, Native annual grasses, Introduced annual grasses, <br />Native perennial forbs, Introduced perennial forbs, Native perennial graminoids (includes <br />grasses and grass-like plants), Introduced perennial graminoids, Shrubs (all of these being <br />native at this site), Trees (likewise all native in the study area), and Ferns. <br />Plant Species Frequency and Density Measurements <br />During the course of cover sampling, all plant species occurring within one meter on ei h r side <br />of the cover sample transect were noted as present within each sample. Frequency for each <br />plant species observed during sampling was calculated by dividing the number of sample <br />transects in which the species was observed by the total number of samples (see cover sample <br />distribution by area above). As such, this value is probably more correctly known as <br />"constancy". Relative vegetation cover was calculated by dividing the absolute cover of each <br />species by the total vegetation cover with the result expressed as a percent. <br />The total number of species (within each lifeform) observed in each sample provide a measure <br />of "species density", indicating relative species richness of different areas. These measures <br />• reflect progress toward return of diverse species composition in the reclaimed areas from a <br />different perspective than is available from examination of cover data alone. <br />Plant Species Listing <br />During the course of the field work, a list of all encountered plant species (quantitative plus <br />incidental observations) was compiled for each reclamation area and the two reference areas. <br />Scientific names used follow Weber and Wittman (1992); common names cited may be found in <br />Beetle (1970), Nickerson et al. (1976), or SCS (1979). Cross reference to the substantially <br />revised scientific nomenclature for the flora of Western Colorado, as set forth by Weber <br />(1987), may be determined by reference to Weber and Wittman (1992). References for <br />noxious weeds included Thornton et al.(1974) and Routt Co. Extension Agent, personal <br />communication (1993). <br />Plant species for which nomenclature has changed since the 1994 report was produced include <br />Descurainia incana (formerly D. richardsonii), Achnatherum lettermanii (formerly i a <br />lettermanii), Achnatherum nelsonii (formerly Stioa nelsonii), Hesperostipa comata (formerly <br />Stipa comata), and Nassella viridula (formerly Stipa viridula). <br />• <br />7 <br />