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supplemental study areas. Likewise, important (orbs of the Yoast area Sagebrush, such as timber milkvetch, showy fleabane, showy goldeneye, and common yampa, are entirely • absent from the type as described by Tiedeman and Terwilliger in the Piceance Basin. It should be noted that the Yoast study area Sagebrush was similar to that documented by other studies in south~entral Routt County (ESCO 1988, 1990), but differs in the greater abundance of such indicators of more mesic environments as nettleleaf giant hyssop and aniseroot in the Yoast Sagebrush type. Conversely, the abundance of the spring ephemerals, arrowleaf balsamroot and mulesear, was less in the Yoast Sagebrush, as was the abundance of the bulbous spring ephemerals James starwort and tapertip onion. This latter fact suggests that the soils are loamier and remain moist longer in the Yoast study area than in the Seneca II and Seneca II-W areas (ESCO 1988, 1990). The Sagebrush vegetation type in the Yoast study area corresponds to the Mountain Loam range site (No. 228) of the SCS. As with a great number of range site descriptions, this one fails to account for the natural presence of Agassiz bluegrass, a major component of the herbaceous understory. The Western Wheatgrass /Alkali Sagebrush vegetation type corresponds to the Artemisia longiloba or Artemisia longiloba / Agfopyron smithii associations of Baker (1982). The • former was based on a vegetation description from North Park (Jackson County) by Smith (1966). The latter is based on the SCS Claypan range site description (No. 296) for the Southem Rocky Mountains Land Resource Area (LRA 48). This range site was listed as occurring in the Craig and Steamboat Springs SCS field office districts, which include the region of the Yoast study area. The Mesic Drainage vegetation type of the Yoast study area was inclusive of various subunits comparable to various drainage area vegetation types elsewhere in Colorado. The areas dominated by box elder probably fit within the broad unit identified by Baker (1982) as Box Elder, West Slope Riparian. The areas dominated by basin wildrye, Agassiz bluegrass, and mountain snowberry correspond to the Mountain Swale range site {No. 245) of the Southern Rocky Mountains Land Resource Area (LRA 48). This range site was, in turn the basis for the Elymus cinereus Montane Riparian Grassland association of Baker (1982). A rather large part of the drainage bottom sites included in the Mesic Drainage vegetation type have been disturbed historically in an attempt to 'improve' the sites for agricultural use, as evidenced by the abundance, and even dominance, by such European domestic grasses as • smooth brome, orchard grass, and timothy. These drainage bottom sites were also disturbed 24