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• Improved Pasture-Subirrigated <br />The Improved Pasture-Subirrigated vegetation type was more highly managed than native <br />types and was dominated by native and inVoduced perennial grasses with 27.5 percent and <br />23.1 percent cover respectively in 1990 and 48.3 and 17.7 percent cover respectively in <br />1992. This type exhibited the lowest species occurrence (3 species) and cover (0.5 <br />percent) for shrubs; the lowest cover (8.1 percent) and second lowest species occurrence <br />(27 species) for native perennial forts; and the lowest species occurrence for native <br />perennial grasses (8 species). The common occurrence of shrub seedlings in this type <br />combined with other growth form similarities indicate that this type would become more <br />like the Mesic Drainage vegetation type in the absence of management. <br />Florlatlc Patterns <br />Tables A23 and B30 present the species that were observed in the Yoast Baseline and <br />Supplemental study areas and lists each vegetation type in which these species were <br />encountered during quantitative sampling. This list is not comprehensive and does not imply <br />that species are never found in communities in which they were not observed during the <br />course of this study. The species and growth forms which were found at least once in all of <br />• the six 1990 Baseline Study Area vegetation types and all but one of the eleven 1992 <br />Supplemental Study Area vegetation types include: <br />Introduced biennial fort <br />Hound's tongue (Cvnoclossum officinalel <br />prickly lettuce (Lactuca serriolal <br />Salsify (Traco~ogon dubiusl <br />Native perennial fort <br />western yarrow (Achilles lanulosal <br />Eaton thistle (Cirsium eatonii) <br />showy fleabane (~ erq on sneciosusl <br />common yampa (Perideridia yairdneril <br />Pacific aster (Viraulaster adscendensl <br />Introduced perennial fort <br />dandelion (Taraxacum officinalel <br />Native perennial graminoid <br />slender wheatgrass (E(ymus trachvcaulus ssp. trachycaulusl <br />mountain brome (Ceratochloa carinatal <br />western wheatgrass (Pascopylum smithiil <br />Agassiz wheatgrass (Poa aaassizensisl <br />• <br />29 <br />