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s ~ ~ ~ ~^ ~ ~ ~ +~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ <br />Table 6. COVER, FREQUENCY AND IMPORTANCE VALUE SUMMARY FOR THE GRASSLAND REFERENCE <br />AREA AT THE WALDEN COAL PROJECT SITE. BASED ON 1997 (AUGUST 19) DATA FROM <br />FIFTEEN 25-METER POQdT TRANSECTS. +/- 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 14.08 0- IZ 80.00 8.57 22.65 2 <br />Agropyron smithti 0.07 0.24 0- 1 6.67 0.71 0.95 l6 <br />CalamagrosHs montanensis 0.13 0.48 0- 1 13.33 1.43 1.91 15 <br />Carex eleocharis 1.13 4.06 0- 6 46.67 5.00 9.06 11 <br />Carex filijolia 1.60 5.73 0- 4 73.33 7.86 13.58 6 <br />Koeleria macrantha 1.87 6.68 0- 10 60.00 6.43 13.11 7 <br />Oryzopsis hymenoides 0.13 0.48 0- 1 13.33 1.43 1.91 15 <br />~ Poa sardbergii 0.07 0.24 0- 1 6.67 0.71 0.95 16 <br />Stipa comata 6.40 22.91 0- 16 86.67 9.29 32.19 I <br />Sub-total 15.33 54.88 <br />WARM SEASON PERENNIAL GRASSES <br />Bouteloua gracilis 0.40 1.43 0- 2 26.67 2.86 4.29 14 <br />Sub-total 0.40 1.43 <br />FORBS <br />Chenopodium sp. <0.01 <0.01 0- <1 0.00 0.00 0.00 17 <br />Eriogonum sp. 0.07 0.24 0- 1 6.67 0.71 0.95 16 <br />Sub-total 0.07 0.24 <br />PERENNIAL FORBS <br />Astragalus kentrophyta 1.47 5.25 0- 6 53.33 5.71 10.96 9 <br />Astragalus pectinatus <0.01 <0.01 0 <1 0.00 0.00 0.00 17 <br />Astragalus spatulatus <0.01 <0.01 0- <1 0.00 0.00 0.00 17 <br />Comandra umbellata 0.07 0.24 0- I 6.67 0.71 0.95 16 <br />