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• between 6,800 and 9,200 feet. The calcareous old (high terrace) alluvium of the sort usually <br />associated with this plant is absent in the study area. The nearest populations of Harrington <br />beardtongue are in the extreme southeast corner of Routt County and southwest corner of Grand <br />County. To find it in the Hayden area would be a significant range extension to the northwest. <br />Penland beardtounge (Penstemon penlandil) is a Colorado endemic found only in Grand County. <br />It occurs on strongly seleniferous clay - shales of the Troublesome Formation on steep barrens <br />with sparse plant cover as well as sagebrush badlands. It is found at elevations ranging from <br />7,500 to 7,700 feet, at the upper range of the elevation range of the Study Area.. This plant <br />occurs in Middle Park near populations of Astragalus osterhoutd. The Troublesome Formation <br />occurs only to the east of the Study Area, past Steamboat Springs, CO, so this endemic species <br />is unlikely to occur in the Study Area. <br />North Park phacelia (Phacelia formosula) is a narrow Colorado endemic found in North Park in <br />Jackson County in sparsely vegetated exposures of the Coalmont Formation. The Coalmont <br />Formation is composed of conglomerate, sandstone, siltstone, shale, carbonaceous shale and <br />coal beds (Roberts and Rossi, 1999). The plant is found in steep -sided ravines and on low sandy <br />hills and bluffs at elevations of 8,000 to 8,500 feet. Because the Coalmont Formation is unique to <br />• the North Park area, this species would be unlikely to occur in the Study Area. <br />Piceance twinpod (Physaria obcordata) is a Colorado endemic that is found in the Piceance <br />Basin in Rio Blanco County, Colorado. This species is found on barren white outcrops and steep <br />slopes exposed by creek downcutting. It is restricted to the Parachute Creek Member of the <br />Green River Formation at elevations between 5,900 and 7,500 feet. Because of its restrictive <br />habitat, this species is unlikely to occur in the Study Area. <br />Rock tansy (Sphaeromeria capitata) is found in northwestern Moffat County in Colorado and in <br />Montana, Wyoming and Utah on dry, rocky hills and desert flats in silty soils at elevations ranging <br />from 7,500 to 7,900 feet. For some of the same reasons listed for Debris milkvetch, Rock tansy is <br />not known in Routt County and unlikely to occur in the study area. This plant occurs in the same <br />area as A. jejunus and E. acaule and on the same formations of Tertiary age. <br />Ute Ladie's- tresses Orchid (Spiranthes diluvialis) is known to occur in the Green River watershed <br />in Dinosaur National Monument in far western Moffat County. Occurrences of this plant are <br />comparatively broad in terms of the geologic origin of soil parent material, but are tied to wetland <br />conditions. With regard to elevation, its occurrences in Colorado have varied from 4,500 to 6,800 <br />• 32 <br />