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TABLE 18 . TREE AND SHRUB DENSITY DATA - MESIC DRAINAGE VEGETATION TYPE, PEABODY SENECA II-W MINE EXPANSION AREA, 1990 <br />PLANT SPECIES' Stems per 50 sq. m AVG. • I AVG. a/ <br />Sample Number 1 2 3 4 5 50 sq. m acre <br />Acer negurxb 3 4 1 .4 1 13.3 <br />Amelanchier alnitolia 3 6 3 8 4.0 323.7 <br />Artemisia Cana 2 3 1 1 .2 97.1 <br />Arremisia tridentata v. tridentata 2 1 1 7 2.2 178.0 <br />Artemisia tridentata v. vaseyana 6 1 .2 97.1 <br />Chrysothamnus nauseosus 2 2 1 9 2.6 226.6 <br />Chrysothamnus visciditlorus 2 4 1 .2 97.1 <br />Crataegus rivularis 4 1 3 1.6 129.5 <br />Prunus virginiana 7 6 1 1.6 129.5 <br />Ouercus gambelii 1 0.2 16.2 <br />Ribes aureum 2 0.4 32.4 <br />Ribes inerme 7 3 1 2.2 178.0 <br />Rosa woodsii 6 5 6 1 8 7.0 566.5 <br />Salix sp. 23 4.6 372.3 <br />Swida sericea 2 0.4 32.4 <br />Symphoricarpos oreophilus 20 24 B 1 44 19.4 1570.0 <br />TOTAL STEMS PER 50 sq.m 36 57 26 3 128 50.0 4046.5 <br /> Std. Dev. <br /> (n-1) <br /> 47.7 <br /> ' MATURE unless otherwise indicated. <br />• Pa~1 • <br />