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Table 3. Reference area. Cover, frequency, and species diversity summaries for herb layer components in <br />the grassland community. Based on data from 20 lm2 quadrats. values equal the standard deviation <br />(S.D.). Importance Value (I.V.) = Relative Cover + Relative Frequency. 1980 data. <br />J <br /> <br />Mean <br />Cover <br />Relative <br />Cover Range of <br />Cover <br />Values <br />Percent <br />Frequency <br />Relative <br />Frequency <br /> <br />I.V. <br /> <br />Rank <br />GRASSES AND SEDGES <br />Agropyron smithii 2.7 17.76 0- 5 90.0 9.84 27.60 1 <br />Bouteloua gmcilis 0.2 1.32 0- 3 5.0 0.55 1.87 16 <br />Calamagrostis mo>itanensis 0.6 3.95 0- 3 40.0 4.37 8.32 10 <br />Carex eleocharis <0.1 <0.01 0-<1 15.0 1.64 1.64 17 <br />Carex filifolia 1.1 7.24 0- 6 45.0 4.92 12.i6 8 <br />Koeleria macrantha 0.6 3.95 0- 5 35.0 3.83 7.78 12 <br />Oryzopsis Ttymenoides 0.5 3.29 0- 3 45.0 4.92 8.21 11 <br />Pca san2cergii 0.1 0.66 0- 1 20.0 2.19 2.85 15 <br />Stipa comata 1.0 6.58 0- 5 70.0 7.65 14.23 6 <br />FORBS <br />Astragalus tegetarius 0.1 0.66 0- 1 25.0 2.73 3.39 14 <br />Astragalus tri,dactilicus <0.1 <O.U1 0-<1 5.0 0.55 0.55 22 <br />Astragalus sp. <0.1 <0.01 0-<1 5.0 0.55 0.55 22 <br />Comandra umbeliata <0.1 <0.01 0-<1 10.0 1.09 1.09 20 <br />Ericgonzun paucifZorum 0.1 0.66 C- 1 5.0 0.55 1.21 19 <br />~ h'yme>wxys richardsanii 2.2 14.47 <1- 5 100.0 10.93 25.40 2 <br />Lesquerella montana <0.1 <0.01 0-<1 15.0 1.64 1.64 17 <br />Paronychia sessiliflora 1.4 9.21 0- 8 55.0 6.01 15.22 5 <br />Pfilox hoodii 1.3 8.55 0- 5 70.0 7.65 16.20 4 <br />,hZox pwniZa <0.1 <0.01 0-<1 5.0 0.55 0.55 22 <br />T~nsendia exscapa <0.1 <0.01 0-<1 10.0 1.09 1.09 20 <br />~ <br />~~ <br />