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gianthyssop) , 0.7~ cover and 19$ frequency, and Lathyrus leucanthus <br />(aspen peavine), 0.4~ Dover and 17.2 frequency. <br />The mined brush type/aspen subtype oras the frost productive type studied <br />with a dry weight production of 1818.9 lbs/acre as compared to 1103.3 <br />lbs/acre for upland sagebrush. The shrub stratum accounted for 75.38 <br />of the total production, while the forbs and grasses accounted for <br />15.7 arri 9.08, respectively. Snowberry (500.5 lbs/acre), Gambel oak <br />(250.4 lbs/acre) and sagebrush (241.9 lbs/acre) were the frost productive <br />shrubs. Of the herbaceous understory, Eriogonum umbellatum var. majus <br />suffer (suffer wildbuckwheat), 40.2 lbs/acre, nettleleaf gianthyssop, <br />36.8 lbs/acre, and slender wheatgrass, 28.4 lbs/acre, evidenced the <br />most productivity. Percent rtoisture content averaged SO.lo for the <br />grass stratum and 64.90 for the forb stratum. <br />Average height of shrub species measured in the mixed brush type/aspen <br />subtype was 178.3 cm. The largest species was Gambel oak with an <br />average shrub height of 346.3 an follaaed by serviceberry (280.5 ~ <br />and chokecherry (138.7 ctn). Snaabei2y was the smallest shrub species <br />~• with an average shrub height of 63.0 cm. <br />Age-height data indicate that the species containing the oldest <br />individual in the type was Gambel oak (average = 71.4 years ± 10). <br />The youngest species was snocaberry (average = 9.9 years ± 5). Shrubs <br />cacrprising the mixed brush type appeared to be older than those in the <br />upland sagebrush type and younger than those ccmg~rising the aspen <br />subtype shrub stratum (Table 13). <br />Aspen Subtype. The aspen vegetation subtype comprised 112 acres or 4.10 <br />of the total lands on the stu3y area. Most of the subtype was located <br />along south and east facing draws at the upper elevations. The subtype <br />was characterized by dense stands of aspen averaging 594.5 trees/acre <br />with a shrub understory cacq~rised mainly of t;nuntain snaaberry, coarmn <br />chokecherry and Gamhel oak. The herbaceous understory was dominated <br />by western yarroci, nettleleaf gianthyssop and Kentucky bluegrass. <br />l~ <br />-57- <br />