. Plant species of concern and plant associations of Powder River county, Montana . Figure 30. Photogiapli of Psoralea hypogaea including root sandstone outcrops and those of tlie Powder River valley. Comments: Initial obseivations indicate tliat it is not sensitive to grazing and related indirect influences. The size of populations appears to be directly related to tiie extent of available habitat, with a capacity to persist in low, isolated pockets. Heidel, B. and H. Marriott. 1996. Sensitive plant species survey in the Ashland Distjict, Custer National Forest. Report to tlie Forest Se
. Plant species of concern and plant associations of Powder River county, Montana . Figure 30. Photogiapli of Psoralea hypogaea including root sandstone outcrops and those of tlie Powder River valley. Comments: Initial obseivations indicate tliat it is not sensitive to grazing and related indirect influences. The size of populations appears to be directly related to tiie extent of available habitat, with a capacity to persist in low, isolated pockets. Heidel, B. and H. Marriott. 1996. Sensitive plant species survey in the Ashland Distjict, Custer National Forest. Report to tlie Forest Service. Montana Natural Heritage Progi'am, Helena. Heidel, B. L. 1997. Preliminaiy Botanical Survey in the Tongue River Aiea, Montana. Unpublished report. Montana Natural Heritage Progiam, Helena. 11 pp. plus appendices and map. Parker, J. L., L. R. Guptill, K. M. Bajema, W. A. Berg, L. Logan, and R. E. Adams. 1971. Soil Sui'vey of Powder River Area, Montana. Soil Conservation Service (Natural Resources Conservation Service), Bozeman, MT. Schassberger. L. A. 1988. Status review of Astragalus barrii. Custer National Forest. Unpublished report, Montana Natural Heritage Progiam, Helena. 61 pp. LITERATURE CITED Doni, R. D. 1984. Vascular Plants of Montana. Mountain West Publishing, Cheyenne, WY. 276 pp. Heidel, B. L. 1994. Survey for PSORALEA H\TOGAEA in tlie Great Falls Resource Area, Lewistown District. Unpublished report to tlie Bureau of Land Management, Montana. Montana Natuial Heritage Program. 22 pp. plus appendices. Schassberger, L. A. 1990. Report on die conservation status oiAstragalus barrii, a candidate threatened species. Unpublished report to the Fish and Wildlife Service, Denver. Montana Natural Heritage Program, Helena. 85 pp. Vanderhorst, J., S. V. Cooper, and B. Heidel. 1998. Botanical and vegetation survey of Carter County, Montana. Unpublished report to Bureau of Land Management. Montana Natural Heritage Progiam, Helena. 116 pp. + app. Heidel, B. L. and K. H
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