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<br />Table 6. COVER, FREQUENCY AND IMPORTANCE VALUE SUMMARY FOR THE GRASSLAND REFERENCE AREA AT THE <br />WALDEN COAL PROJECT SITE. BASED ON 1998 (JULY 27) DATA FROM FIFTEEN 25-METER POINT TRANSECCS. <br />± VALUES EQUAL THE STANDARD DEVIATION. <br />Mean Relative Range of Percent Relative Importance <br />Species Cover Cover Cover Values Frequency Frequency Value Rank <br />COOL SEASON PERENNIAL GRASSES <br />Agropyron dasystachyum 3.93 15.69 1 -13 100.00 6.38 22.07 2 <br />Agropyron smithii <0.01 <0.01 0 -<1 6.67 0.43 0.43 22 <br />Calamagrostismontanensis <0.01 <0.01 0-<1 26.67 1.70 1.70 20 <br />Carex eleocharis 0.67 2.66 0 - 4 46.67 2.98 5.64 13 <br />Carex fllifolia 1.53 6.12 0 - 4 73.33 4.68 10.80 9 <br />~ <br />Koeleria macrantha 2.33 9.31 0 - 7 93.33 5.96 15.27 3 <br />, <br />° Oryzopsis hymenaides 0.07 0.27 0 - 1 73.33 4.68 4.95 15 <br />Poa sand6ergii 0.07 0.27 0 - 1 80.00 5.11 5.37 14 <br />Stipa romata 4.20 16.76 <1 - 9 100.00 6.38 23.14 1 <br />Sub-total 12.80 51.06 <br />WARM SEASON PERENNIAL GRASSES <br />Bouteloua gracilis 0.33 1.33 0 - 3 33.33 2.13 3.46 18 <br />Sub-total 0.33 1.33 <br />PERENNIAL FORBS <br />Androsace septenhionalis <0.01 <0.01 0 -<1 6.67 0.43 0.43 22 <br />Astragalus kentrophyta 1.87 7.45 0 - 6 80.00 5.11 12.55 7 <br />Ashagalus pectinatus <0.01 <0.01 0 - <1 13.33 0.85 0.85 21 <br />Astragalus sp. <0.01 <0.01 0 -<1 6.67 0.43 0.43 22 <br />Astragalus spatulatus <0.01 <0.01 0 -<1 13.33 0.85 0.85 21 <br />Comandra um6ellata 0.07 0.27 0 - 1 26.67 1.70 1.97 19 <br />Erigonum sp. 0.13 0.53 0 - 2 53.33 3.40 3.94 17 <br />Hymenoxys richardsonii 0.80 3.19 <1 - 3 100.00 6.38 9.57 11 <br />Paronychia sessiliflora 2.00 7.98 0 - 8 93.33 5.96 13.94 4 <br />