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• addition, the difference in the depositional environment of Green River Formation materials <br />versus Mesa Verde Group and Lewis Shale materials has been discussed above. <br />Narrow -stem gilia (Gilia stenothyrsa) is found in Utah and Colorado in Mesa and Rio Blanco <br />Counties on silty to gravelly loam soils of the Green River and Uinta Formations. The habitats <br />within which this species are found include grasslands, sagebrush, mountain - mahogany and <br />pinyon - juniper at elevations between 5,000 and 6,000 feet, much lower than the Study Area <br />elevation range. In addition, the difference in the depositional environment (and geochemistry) of <br />Green River and Uinta Formation materials versus Mesa Verde Group materials and Lewis Shale <br />has been discussed above. <br />Rabbit ears gilia (Ipomopsis aggregata subsp. weber) is found in Colorado in Grand, Jackson <br />and Routt Counties and also on Rabbit Ears Pass which straddles Routt and Jackson Counties. It <br />is also dubiously reported in northern Idaho and southeast Wyoming. This species occurs in <br />openings in coniferous forests at elevations of 8,000 to 9,600 feet, slightly higher than elevations <br />at the Study Area but close enough to consider occurrences possible although the small areas of <br />coniferous forest in the study area are steeply north - facing and possess nearly closed canopies. <br />This plant may be just a local variant (forma) of Ipomopsis aggregata ssp. attenuata and the <br />• reports of its occurrence in Wyoming and Idaho erroneous. The form with filiform corolla tube <br />does occur on Rabbit Ears Pass (type locality). Plants present on Muddy Pass just a few miles <br />away, on the Buffalo Pass road north of Steamboat Springs, and everywhere in North Park, <br />Ipomopsis aggregate. ssp. attenuata. Specimens of Ipomopsis aggregata will be sought in spring <br />2009 to ascertain the presence of at least some "flare" to the corolla tube (widening slightly from <br />base to apex). A very slight widening would correspond to Ipomopsis aggregata. ssp. attenuata. <br />Plants with very noticeable "flare" (widening very noticeably) would be classical Ipomopsis <br />aggregata. <br />Dudley Bluffs bladderpod (Lesquerella congesta) is endemic to the Piceance Basin of Colorado in <br />Rio Blanco County and occurs on barren, white shale and oil shale outcrops of the Green River <br />and Uinta Formations. These outcrops are often exposed along drainages through erosion from <br />downcutting of streams. This species occurs at elevations between 6,000 and 6,700 feet, just <br />below the lower elevation range of the Study Area. This species is not likely to occur within the <br />Study Area. In addition, the difference in the depositional environment (and geochemistry) of <br />Green River and Uinta Formation materials versus Mesa Verde Group and Lewis Shale materials <br />has been discussed above. <br />• 30 <br />