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.~ <br />RAiIGE SITE k0. 281 Page 2 <br />MOUNTAIN OUTWASH <br />August 1975 <br />muhly, along with a few forbs such as scarlet globemallow, eriog- <br />onum, senecio, loco, evening primrose, and paintbrush. Scattered <br />shrubs include Green's rabbitbrush, an occasional low-growing <br />form of rubber rabbitbrush, wlnterfat, and fourwing saltbush. Small <br />amounts of prickly pear also occur and there may be some fringed <br />sage, smooth horsebrush, snakeweed, and yucca. <br />Native {potential) Vegetation and Guide for Determining Range <br />tonditlon. <br />Percentage composition by weight of the principal species may <br />• total as much as: <br />Blue grama 30 <br />Squlrreltail 15 <br />Indian ricegrass 15 <br />Western wheatgrass 15 <br />Wlnterfat 15 <br />Needle-and-thread 10 <br />Fourwing saltbush 10 <br />Sand dropseed 5 <br />Fendler three-awn 5 <br />Green's rabbitbrush 5 <br />Others (as listed above) 10 <br />Tree species are not in the natural plant community. Approximate <br />ground cover is 30$. ' <br />• Spad es most likely to invade the site are annual forbs such as <br />lambsquarter, Kochia, Russian thistle, sunflower, tansy mustard, <br />and peppenNeed. Some of these may come In temporarily on well- <br />vegetated range when spring and early summer moisture are above <br />average. As the ecological tonditlon deteriorates, the maJor <br />grasses--except blue grama--decrease sharply; and some eventually <br />disappear. They give way to mixtures of blue grama, Green's and <br />rubber rabbitbrush, snakeweed, and prickly pear. Such vegetation <br />now characterizes most of the site. With advanced deterioration, <br />ring muhly may make up much of the sparse grass cover, and blue <br />grama breaks into weak, scattered plants. The above-mentioned <br />shrubs, with annual forbs, are then dominant; and there is much <br />bare ground. <br />~..~ <br /> <br />