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• native perennial grasses and graminoids, introduced perennial grasses, native shrubs, native <br />trees, ferns (and fern allies), lichens, and bryophytes (mosses). <br />• <br />r � <br />Plant Species Frequency and Density Measurements <br />During the course of cover sampling, all plant species occurring within one meter of either side of <br />the cover sample transect were noted as present. Frequency for each plant species observed <br />during sampling was calculated by dividing the number of sample transects in which the species <br />was observed by the total number of samples (see cover sample distribution by area above). As <br />such, this value is probably more correctly known as constancy. <br />The total number of species within each lifeform observed in each 100 square meter sample <br />provides a measure of "species density ", indicating the relative species richness of different <br />areas. These measures provide a means of examining progress toward the return of diverse <br />species composition in the reclaimed areas. <br />Plant Species Listing <br />Scientific names used follow Weber and Wittmann (2001); common names cited are found in <br />Beetle (1970), Nickerson et al. (1976), or Soil Conservation Service (1979). Cross - references <br />between older names and the revised scientific nomenclature for the flora of Western Colorado <br />used here can be made by reference to Appendix 2 of this report. <br />During the course of the fieldwork, a list of all plant species encountered (quantitative plus <br />incidental observations) was compiled for each potentially affected area vegetation type and for <br />the three reference areas. These lists are summarized in Appendix 2, Species Presence for All <br />Areas, which includes current nomenclature and cross - references to older nomenclature. Note <br />that all big sagebrush plants encountered were referred to as Seriphidium tridentatum. Plants <br />referred to here as Poa secunda are the plants formerly known as big bluegrass (Poa ampla) a <br />species commonly included in reclamation seed mixes. The taxonomic treatment of Weber and <br />Wittmann (1996) places Poa ampla (as well as Poa sandbergh) with Poa secunda. Despite this <br />merger, the distinctness of Poa ampla is worth noting. Mountain bromegrass encountered during <br />sampling is referred to as Ceratochloa polyantha in recognition of its perennial habit compared to <br />the C. carinatus taxon described in Weber and Wittmann (2001) which is an annual. <br />7 <br />