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RULE 2 - PERMITS <br />chokecherry, and mountain snowberry. Other commonly occurring shrubs include Rocky <br />• Mountain maple (Acer glabrum) and gooseberry (Ribes inerme). <br />As is typical of aspen vegetation types in western Colorado, the native perennial forbs life form <br />(comprising most of the understory) is relatively abundant and diverse, and includes western <br />yarrow, nettle -leaf giant hyssop (Agastache urticifolia), white -flower peavine (Lathyrus <br />leucanthus), chiming bells (Mertensia ciliata), western aniseroot (Osmorhiza occidentalis), <br />cutleaf coneflower (Rudbeckia ampla), meadow -rue (Thalictrum fendleri), edible valerian <br />(Valeriana edulis), and American vetch (Vicia americana). <br />The native perennial cool season grass component is comprised of elk sedge, blue wildrye <br />(Elymus glaucus), and Agassiz bluegrass. Other common native perennial cool season grasses <br />include onion -grass (Bromelica spectabilis), Porter brome (Bromopsis porteri), slender <br />wheatgrass, and fowl bluegrass. <br />Introduced perennial cool season grasses are usually only erratically present, and are mostly <br />confined to a few stands where horses or other livestock may have been quartered and fed with <br />hay from meadows planted with European species. Common timothy is the most prevalent, but <br />occasional occurrences of smooth brome or orchardgrass (Dactylis glomerata) are encountered. <br />Annual forbs in this heavily shaded area are also relatively sparse, but may include Richardson <br />tansymustard (Descurainia incana) or oak -leaf goosefoot (Chenopodium foliosum). <br />Three minor vegetation types are established within various portions of large vegetation areas <br />• throughout the PSCM permit area. The sizes of these areas are minor and they do not affect the <br />overall vegetation structure of the PSCM permit area. As such they are not illustrated on Map <br />2.04.10-M1, Vegetation — Permit Area. Descriptions of these three types include: <br />• Alkali Meadow - This vegetation type is found in alkaline drainage bottoms between hills and is <br />largely dominated by sagebrush and western wheatgrass. Although soils located within this <br />vegetation type are alkaline -affected, herbaceous biomass production is high. Native perennial <br />grasses are the most abundant life form, including species adapted to, or tolerant of, moderately <br />high soil salt content. The most common among these species are western wheatgrass, slender <br />wheatgrass, foxtail barley (Criterion jubatum), Agassiz bluegrass, big bluegrass (Poa ampla), <br />and Nuttall alkaligrass (Puccinellia airoides). <br />Introduced perennial grasses are modestly abundant and include meadow barley (Criterion <br />brachyantherum) and common timothy. Some introduced annual and biennial forbs occur <br />including burning -bush (Bassia sieversiana) and tumbling orach (Atriplex rosea). <br />• Alkali Sagebrush/Greasewood - This vegetation type is located in small toe -slope areas where <br />alkaline conditions prevail. It has relatively sparse plant cover. Alkali sagebrush is the most <br />abundant shrub. Black greasewood (Sarcobatus vermiculatus) provides limited cover. Native <br />perennial grasses include western wheatgrass and smaller amounts of Junegrass (Koeleria <br />macrantha) and Agasssiz bluegrass. <br />• Native perennial fortis are less important and include western yarrow, groundsmoke, curlycup <br />gumweed, stemless goldenweed, and meadow aster (Virgulus campestris). Introduced perennial <br />PSCM Permit App. 2.04-139 6/15/09 <br />