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and biennial forts, Introduced annual and biennial forts, Native annual grasses, Introduced <br />annual grasses, Native perennial (orbs, Introduced perennial (orbs, Native perennial <br />graminoids (includes grasses and grass-like plants), Shrubs (all of these being native at this <br />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 either side <br />of fhe cover sample transact 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 />Uansects 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 />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). <br />The Mountain Brush and Sagebrush reference azeas were sampled to provide data for <br />comparison with reclaimed area data. <br />Within each reclamation and reference area, representative color photographs were taken to <br />document the appearance of the vegetation in 1993. Within each photo, a placard identifies the <br />r1 <br />5 <br />