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Table 15. TRENDS IN MEAN COVER FOR THE PORTION OF THE RECLAIMED AREA SEEDED IN 1488. WALDEN COAL <br />PROJECT SITE. BASED ON DATA COLLECTED BETWEEN 1989 AND 1998. MEAN COVER VALUES IN PERCENT. <br />w <br />Year 1989 1990 1991 1992 1993 1994 1995 19% 1997 1998 <br />Sample Size 14 14 14 14 14 14 14 14 20 20 <br /> <br />COOL SEASON PERENNIAL GRASSES <br />Agropyron dasystachyum 6.57 17.57 9.86 18.43 20.00 13.00 8.14 9.71 4.40 9.85 <br />Agrostis scabs 0.00 <0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Agropyron smithii 2.29 3.57 1.57 0.57 0.57 0.57 0.00 0.14 0.05 0.15 <br />Agropyron spicatum 0.00 <0.01 <0.01 <0.01 <0.01 <0.01 0.00 0.00 0.00 <0.01 <br />Agropyron trachycaulum 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 <br />Ceratochloa marginate 0.00 0.00 0.00 0.00 0.00 <0.0] 0.00 0.00 0.00 0.00 <br />Deschampsia caespitosa 0.00 <0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Festuca idahoensis 0.00 0.00 0.00 0.00 1.14 0.00 0.00 0.00 0.00 0.05 <br />Hmdnim jubatum 0.00 <O.Ql <0.01 <0.01 0.00 0.00 <0.01 0.00 0.00 0.00 <br />Koeleria maoantha 0.00 0.00 0.00 0.00 <0.01 0.00 0.00 0.00 0.00 0.05 <br />Oryzopsis hymenoides 0.00 <0.01 <0.01 <0.01 <0.01 0.74 <0.01 <0.01 0.00 <0.01 <br />Poa ample 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 <0.01 <br />Paa compressa 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <0.01 0.00 <br />Poa sandbergii 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 <0.01 <br />Stipa Columbiana 0.00 0.00 0.00 0.00 0.00 0.00 <0.01 0.00 0.00 <0.01 <br />Stipa vindula 0.43 0.00 0.00 <0.01 0.00 0.00 0.00 0.00 9.50 0.05 <br />Subtotal 9.29 21.19 11.46 19.18 21.89 13.71 8.17 10.00 4.50 ]0.15 <br /> <br />INTRODUCED PERENNIAL GRASSES <br />Agropyron cnstatum 0.00 <0.01 0.00 <0.01 0.14 <0.01 <0.01 <0.01 <0.01 0.05 <br />Alopecun~s pratensis 0.00 3.00 <0.01 1.29 1.00 0.71 0.86 0.14 0.10 025 <br />Bromus inermis 0.00 0.00 0.00 <0.01 0.00 0.00 <0.01 <0.01 <0.01 0.00 <br />Elymus juncnis 0.14 3.43 3.86 9.57 9.57 8.71 21.57 15.14 17.05 17.40 <br />Festuca oinna 0.00 2.14 2.86 <0.01 0.43 3.71 0.57 0.71 025 1.75 <br />Subtotal 0.14 8.58 6.72 10.89 11.14 13.13 23.02 16.00 17.40 19.45 <br /> <br />ANNU AL GRASSES <br />Bromus tectorum 0.00 <0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <0.01 <br />