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Table 1. Plant species List: Rimrock Strip Mine (June 2003) <br />ecies Name Common Name Life form Seasonality Origin <br />Graminoids <br />Agropyron smithii Western wheatgrass perennial cool Native <br />Agropyron intermedium Intermediate wheatgrass perennial Cool Introduced <br />Agropyrontrachycaulum Slender wheatgrass perennial cool Native <br />Elymus Trichophorum Pubescent wheatgrass perennial cool Introduced <br />Bromusinermis SmoothBrome perennial coal Introduced <br />Bouteloua gracilis Blue grama perennial warm Native <br />Bouteloua curtipendula Side-oats grama perennial warm Native <br />Buchloe dactyloides Buffalograss perennial warm Native <br />Dacrylisglomerata ~ Orchardgrass perennial cool Introduced <br />Sporabolus cryptandrus Sand dropseed perennial warm Native <br />Stipa viddula Green needle-grass perennial Cool Native <br />Schizachyrium scoparium Linle blueslem perennial warm Native <br />Bromusjaponicus Japanesebrome annual cool Introduced <br />Forbs <br />Ratabidia columnifera Coneflower perennial Native <br />Spheralcea coccinea Scarlet globemallow perennial warm Native <br />Gutierrezia sarothrae Broom snakeweed perennial Introduced <br />Medigaco saliva Alfalfa perennial Introduced <br />Allyssum alyssoides mustard annual Introduced <br />Edcaceae cirsium Red-stem filaree annual Introduced <br />Portulaca oleracea Common purslane annual Introduced <br />Cirsium vulgare Bull Thistle biennial Introduced <br />Heterothica villosa Hairy Golden Aster perennial warm Native <br />Convulvulus arvense Field bindweed perennial warm Introduced <br />Shrubs <br />none <br />only plants encountered during cover sampling are represented on this list <br />