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Table 6. TRENDS IN COVER FOR THE RECLAIMED AREA AT THE WALDEN COAL PROJECT SITE. BASED ON DATA COLLECTED IN JULY, 1989-1992. MEAN COVER VALUES ARE IN PERCENT. Species 1989 1990 1991 1992 Sample Size 20 20 20 20 COOL SEASON PERENNIAL GRASSES Agropyron daeyetachyum 7.40 15.20 8.70 15.40 Agroetis ecabra 0.00 0.01 0.00 0.00 Agropyron emithii 1.90 2.70 1.10 0.40 Agropyron spicatum 0.00 0.01 0.01 0.01 Agropyron trachycaulum 0.00 0.00 0.00 0.10 Deechampsia caespitosa 0.00 0.01 0.00 0.00 Hordeum brachyantherum 0.00 0.10 0.00 0.00 Hordeum jubatum 0.00 0.01 0.01 0.01 Oryzopsis hymenoides 0.00 0.01 0.01 0.01 Poa ampla 0.70 0.00 0.00 0.00 Stipa comata 0.00 0.00 0.00 0.10 Stipa viridula 2.10 1.00 0.01 1.30 Subtotal 12.10 19.05 9.84 17.33 INTRODUCED PERENNIAL GRASSES Agropyron cristatum 0.00 0.01 0.00 0.01 Agropyron intermedium 0.00 0.00 0.00 0.10 Alopecurus pratensis 0.00 2.10 0.01 0.90 Bromus inermis 0.00 0.00 0.00 0.01 Elymus junceus 0.20 2.90 2.80 7.20 Feetuca ovina 0.00 1.50 2.00 0.01 Poa pratensis 0.00 0.10 0.01 0.00 Subtotal 0.20 6.61 4.82 8.23 ANNUAL GRASSES Bromus tectorum 0.00 0.01 0.00 0.00 Subtotal 0.00 0.01 0.00 0.00 PERENNIAL FORBS Achilles lanulosa 0.10 0.01 0.01 0.01 Astragalus titer 0.00 0.10 0.00 0.00 Astragalus crassicarpus 0.00 0.01 0.00 0.00 Astragalus kentrophyta 0.00 0.00 0.01 0.00 Erysimum asperum 0.00 0.01 0.00 0.00 Penstemon strictus 0.00 0.01 0.01 0.01 Rumex salic ifolius 0.00 0.00 0.01 0.00 Subtotal 0.10 0.14 0.04 0.02 ANNUAL AND BIENNIAL FORBS Carduus nutans asp. macrolepis 0.00 0.00 0.01 0.00 Chenopodium atrovirens 1.10 0.01 0.01 0.00 Chenopodium berlandieri 3.10 1.80 0.00 0.00 Chenopodium pratericola 0.00 0.01 0.00 0.00 Descurainia richardsonii 0.00 0.01 0.00 0.01 Kochia scoparia 0.00 0.01 0.00 0.00 Machaeranthera canescens 0.00 0.00 0.00 0.01 Salsola kali 0.40 0.50 0.30 0.00 Sisymbrium altissimum 0.00 0.01 0.00 0.01 Solanum triflorum 0.00 0.00 0.00 0.01 Subtotal 4.60 2.35 0.32 0.04 -16-