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4-96 <br />• <br />• <br />• <br />vidual species while forbs were combined into a single category. <br />Each production plot yielded one composite sample. <br />In the laboratory, clippings were oven-dried at 105° C for 24 <br />hours and weighed 'to the nearest tenth of a gram. Data were <br />recorded as grams per square meter (g/m2) and converted to pounds <br />per acre (lb/ac) using the multiplier of 8.91, Statistical <br />adequacy requirements for production were calculated using the <br />OSM formula above, except that mean production was used in place <br />of mean cover. <br />4.8.6.4 Plant Species Collection and Identification <br />Plant species were collected throughout the 1980 growing season. <br />Species were identified by field ecologists conducting the study <br />and confirmed by Dr. William A. weber, Curator of the Herbarium, <br />University'of Colorado. Taxonomic nomenclature follows Weber and <br />Johnston (1979). Weber (1976), Nickerson et al. (1976), and <br />Beetle (1970) were consulted in an attempt to apply the most <br />widely utilized common names. Primary selenium indicators are in <br />accordance with WDEQ Guideline No. 2 as revised March 1979. <br />Noxious weed designators follow Thornton et al. (1974). State-• <br />ments of origin or provenance follow [Veber and Johnston (1979) and <br />other sources. Voucher specimens have been preserved in a ref- <br />erence collection. <br />Species richness indices for each affected and reference community <br />were determined with the formula: <br />