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CMLRB -Exhibit 7 <br />• Vegetation Information <br />Page 4 <br />Skunkbrush. American Plum. Chokecherry Shrubland <br />In these azeas, deep colluvial deposits support thickets of skunkbrush lRhus trilobata), American <br />plum (Pntnus americans), and Chokecherry (Prunus vireiniana var. melanocaroa). Occasional <br />squaw currant (Rites cereum) and even stunted hackberry (Celtis accidentalis) may be found in <br />these thickets. The American plum and chokecherry do not achieve their typical heights, staying <br />mostly below one meter. This is attributable to the fact that they occur on south- and <br />west-facing slopes that are naturally relatively dry and hot. <br />Riparian Shrubs and Small Trees <br />Occurring in narrow strips along a few sheltered drainages aze developments of mesic shrubs <br />including American plum and chokecherry as well as willows ix sp.) and hawthorns <br />(Crataeeus sp.) that reach heights of a few meters. A few tree species including boxelder (Ater <br />n~ t~~, cottonwood (Populus deltoides and P. X acuminata), and peachleaf willow ($~Ij~ <br />• amYedaloides) occur sporadically. <br />Dense Mountain MahoYanv Shrubland <br />This extensive mapping unit is distinguished by the heavy cover of mountain mahogany. In <br />some parts, there are scattered ponderosa pine. Herbaceous understory consists of sparse cover <br />of species mentioned in the next unit. <br />Grassland with Scattered Mountain Mahoeanv <br />This grassland unit is characterized by the occasional occurrence of mountain mahogany shrubs, <br />mainly on microsites of shallow soil, where grass competition is limited. The grass matrix is <br />dominated by a mixture of cool and warm season species such as western wheatgrass A r r n <br />mi ii , needle-and-thread (Sting somata), junegrass (Kceleria macrarttha), sideoats grams <br />(Bouteloua Curti nce dula), blue grams (Bouteloua gracilis), little bluestem (Schizachyrium <br />sconarium), and Indiangrass (Sorghastrum nutans). Locally, the introduced annual grasses <br />Japanese brome and cheatgrass aze overwhelmingly dominant. <br />• <br />