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• Table 7-1. Herbaceous canopy cover, aboveground primary production and woody stem densities <br />by species for plants encountered on postmine vegetation plots (Derringer Pit) retop- <br />soiled but not seeded in 1989 (1992 sampling season). <br />• <br /> woody <br />life Plant Common Cover Producfioo Deasiry <br />Form Spades Characteristic Name (°5) (#/ac) (atems/ac) <br />Grasses Agropyrnn iolermedium PIG Intermediate Wheatgrass 3 255 <br />Agropyron emitttfi PNG Western Wheatgrass <1 4 <br />Agropyroa irachyeaulum PNG Slender Wheatgrass 2 <I <br />Agropyroo trichophorum PIG Pubescent Wheatgrasa <l <br />Bmmtu inermis P[G Smooth Bmme 3 20t <br />Btomtujaponicus AIG Japanex Brume <I 20 <br />Bmmua marginatus PNG Mountain Brome <1 87 <br />Bromtu tectorum AIG Cheatgrass 18 347 <br />Hordeumjubatum PNG Foxmil Barlry <1 4 <br />Poa pratenais PIG Kentucky Bluegrass 2 <br />Forbs Astragalus dttr PIF Cicer Milkvetch 1 22 <br />Kochia scopsria AIF Summerrypress 4 109 <br />Lettuce serriola BIF Prickly Lettuce 12 130 <br />Lepidium cpp. PI-NF Pepperweed 2 4 <br />Melilotus otfidnaGs BIF Yellow Sweetclover <1 4 <br />Menthe arvensis PNF Field Mint <1 <br />Polygoaum cpp A-PNF Knotweed 2 35 <br />Salsola ka8 (iberica) NF Russiae Thistle 7 <br />Sisymbtium eltissimum AIF Tumble Mustard 7 45 <br />Tarnxacum officinale PNF Dandelion <1 <br />T6laspi arvense AIF Feld Pemycrea+ <I 4 <br />Tagopogon dubius BIF Western Salsify 2 27 <br />Shrubs Amelanchier alnifolia NS Saskatoon Servittberry <] 1 <br />Artemisia trdenata NS Big Sagebrush <t 41 <br />Prunus virginiana NT Common Chokecherty <1 2 <br />Purahia tridentate NS Antelope Bitterbrush <7 7 <br />Symphorirarpos oreophilus NS Mountain Snowberty <1 32 <br />lifter 4 <br />Bare Ground 29 <br />Note: Total herbattous canopy cover was 67 percent of which perennials rcprexnted 13 percent A total of 27 plan[ species were <br />identified in 1992 compared l0 40 in 1991. <br />FVLhb 3P93 <br />[O \92RBPT7] <br /> <br />