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In the Baseline Area, three species from separate life forms codominated the Baseline Area of this • <br />vegetation type. The dominant fort, grass, and shrub were respectively; weedy milkvetch with <br />14.4 percent cover and 100 percent frequency, western wheatgrass with 17 percent cover and <br />80.0 percent frequency, and Alkali sagebrush (Seriohidium arbusculum ssp. lonajlobuml with <br />21.7 percent cover and 86.7 percent frequency. Other important native perennial (orbs include <br />mule's ear with 7.7 percent cover, microseris (Microseris nutansl with 2.2 percent cover, pacific <br />aster (yjrpulaster ascendensl with 2.0 percent cover, sharp-tip onion (Allium acuminatuml 1.1 <br />percent cover, western yarrow with 1.1 percent cover, and one-flower woodsunflower with 1.6 <br />percent cover. Important native perennial grasses include slender wheatgrass with 5.5 percent <br />cover, Agassiz bluegrass with 2.9 percent cover, Letterman needlegrass with 2.0 percent cover, <br />sheep fescue with 1.8 percent cover, and bluebunch wheatgrass (Pseudoroegneria s icata ssp. <br />splCata) with 1.8 percent cover. Important shrubs include mountain sagebrush, and mountain <br />snowberry. The primary introduced species were twolobe speedwell (Porilla biloba) with 2.9 <br />percent cover, salsify with less than 0.1 percent cover but 93.3 percent frequency, tower mustard <br />(Turritis plabral with less than 0.1 percent cover but 66.7 percent frequency, hound's tongue <br />with less than 0.1 percent cover but 53.3 percent frequency, Japanese brome (Bromus j~ponicusl <br />with 0.9 percent cover, smooth brome with 0.2 percent cover, and timothy (Phleum pratensel <br />with less than 0.1 percent cover but 46.7 percent frequency. <br />Species Com <br />osition - Su <br />)emental Area • <br />pp <br />p <br />Shrubs were the most abundant lifeform with 46.4 percent cover, followed by native perennial <br />graminoids (38.2 percent cover), and native perennial forbs (14.3 percent cover). This <br />vegetation type in the Supplemental Area had noticeably more shrub cover and less forb cover than <br />other vegetation type. The latter difference may relate partly to time of observation, as discussed <br />above, but may also relate to the greater abundance of competing shrub cover. The only abundant <br />shrub, as in the baseline area, was alkali sagebrush. The most abundant grasses were western <br />wheatgrass, Letterman needlegrass, Junegrass (Koeleria macranthal, Agassiz bluegrass, and Canada <br />bluegrass (Poa comoressal, in that order. One-flower woodsunflower, Pacific aster, and American <br />milkvetch were the only abundant native perennial forbs. Twolobe speedwell was the only <br />introduced annual /biennial fort of any abundance in 1990 or 1992 sampling, but was <br />considerably less extensive in 1992. Growth of native annual plants was very sparse in this <br />vegetation type; Douglas knotweed in the supplemental area was the only quantitatively measured <br />species in either area or year. <br />u <br />12 <br />