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-Z- Gravelly Foothill X1214 <br />d. High intensity thunderstorms are common from June through <br />August. Wind velocities for the area average 1.2 to 2.9 miles <br />(1.9 km to 4.7 km) per hour and are prevailing from the north <br />and northwest. Generally, March is the windiest month. Strong <br />winds during the spring cause rapid drying of the soil surface. <br />The sun shines approximately 71 percent of the time during the <br />year. <br />3. Native (Climax Potential) Vegetation <br />a. The plant community is about 85 percent grasses, IO percent . <br />forbs, and 5 percent shrubs air dry weight. The production is <br />predominantly made up of grasses; however, the numerous forbs <br />add a distinctive appearance to the landscape. The dominan[ <br />grasses are little bluestem, needleandthread, and prairie <br />sandreed.,,Less abundant grasses are sideoats grams, blue grams, <br />thickspike wheatgrass, western wheatgrass and mountain muhly. <br />Forbs that make up the plant community are dotted gayfeather, <br />Drummond milkvetch, Geyer larkspur, and slimflower scurfpea. <br />Shrubs that are most noticeable on this site ,are fringed <br />sagebrush and spreading eriogonum. <br />b. Relative percentage of total plant community by weight, <br />air-dry: <br />Symbol Common Name Scientific Name Percent <br />Grasses and Grasslike Plants <br />BOGR2 blue grams Bouteloua gracilis 10-20 <br />ORHY Indian ricegrass Oryzopsis hymenoides 0-4 <br />SCSC* little bluestem Schizachyrium scoparium 20-25 <br />MUMO mountain muhly Muhlenbergia.montana 0-10 <br />POFE muttongrass Poa fendleriana 0-3 <br />STC04 needleandthread Stipa somata 15-25 <br />MUCUS plains muhly Muhlenbergia cuspidata 2-7 <br />KOCR prairie junegrass Koeleria cristata 3-5 <br />CALO prairie sandreed Calamovilfa longifolia 15-20 <br />ARL03 red threeawn Aristida longiseta (2) 0-1 <br />SPCR sand dropseed Spotobolus cryptandrus 0-3 <br />POSA12* Sandberg bluegrass Poa sandbergii 0-2 <br />BOCU sideoats grams Bouteloua curtipendula -' 10-15 <br />CAHES sun sedge Carex heliophila T-5 <br />AGDAD* thickspike wheatgrass Agropyron dasystachyum(2) 5-10 <br /> dasystachyum <br />AGSM western wheatgrass Agropyron smithii 5-7 <br />-. <br />;:> <br />:.: <br />"t,. <br />