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(2) Climatic Features; Annual precipitation averages from 18 to 3Q inches (0.46 to 0.76 m), with the average annual temper- ature of 32 to 450 F. (0 to 7.20 C) and a frost-free period of 0 to 60 days. (3) Native Vegetation: This type is a wood- land plant community. Typically, it occurs in pure stands, but where tran- sition is taking place, Douglas-fir, Engelmann spruce, subalpine fir, 1 imber pine, bristlecone pine, or white fir may be a component of this type. (4) Associated Understory Plants: The grasses, forbs and shrubs of the understory in Quaking Aspen woodlands include a diverse group controlled by soils and climatic factors. Grasses are commonly subdominant to tall forbs but in some aspen communities grasses compr.lse a high percentage of the production and cover. The most abundant species Include bearded wheatgrass, blue wildrye, mountain bromegrass, slender wheatgrass, Parry oatgrass, Thurber fescue, Arizona fescue and Idaho fescue. Grasses forming moderately abundant amounts but having fairly high occurrence rates are blue wlldrye. nodding brame, oniongrass, letterman needlegrass, Columbia needle- grass, elk sedge and mountain muhly. Forbs dominate the understory in many aspen stands. Among the principal forbs are cow parsnip, wild celery (LigustiaumJ, and sweet anise. Other common forbs are columbine, larkspur, monkshood, aspen fleabane (ErigeronJ, butterweed groundsel, tall bluebells, meadow rue, gianthyssop (AgastaaheJ, orange sneezeweed, green gentian, valerian, and western coneflower. Forbs generally lower in height than the ones listed above are aspen peavine, heart-leaf arnica, yarrow, lupine, geranium, golden pea, cInquefoil (PotentillaJ, bed- straw, starwort, timber poisonvetch and American vetch. r. - ,.., . . .""";1;.;)( B-6