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'~ <br />Table 3. <br />Herb Layer Components by Growth-form. <br />Mean Cover Comparison for <br />the Dry hleadow Community. <br />Growth-form Affected Area Reference Area <br />Annual Forb 0.2 3.3 <br />Perennial Forb 5.9 3.8 <br />Annual Grass 0.1 <br />Perennial Native Grass 38.0 43.7 <br />Perennial Introduced Grass 0.4 0.4 <br />Mesophytic Shrub 0.5 <br />w=0.2+3.8+38.0+0.4 <br />= 42.4 <br />a=45.7 b=51.0 <br />ISmo = 2 x 42.4 x 100 <br />45.7 + 51.0 <br />= 84.8 x 100 <br />96.7 <br />= 87% <br />