_. 1992. Vascular plants of Wyoming, second edition. Mountain West Publishing, 



Cheyenne, WY. 340 pp. 



Driscoll, R. S., D. L. Merkel, D. L. Radloff, D. E. Snyder, and J. S. Hagihara. 1984. An 



ecological land classification framework for the United States. USDA Forest Service 

 Miscellaneous Publication Number 1439. U. S. Government Printing Office, 

 Washington, D. C. 56 pp. 



Evert, E. F. 1983. A new species of Lomatium (Umbelliferae) from Wyoming. Madrono 30: 143- 

 146. 



Fertig, W. 1994. Staus report on Oryzopsis contracta, a USFWS category 2 candidate 2 species. 

 Wyoming Natural Diversity Database, Laramie, WY.41 pp. 



. 1996. Wyoming plant species of special concern. Wyoming Natural Diversity 



Database. Laramie, WY. 33 pp. 



Hansen, P. L., R. D. Pfister, K. Boggs, B. J. Cook, J. Joy, D. K. Hinckley. 1995. Classification 

 and management of Montana's riparian and wetland sites. Montana Forest and 

 Conservation Experiment Station, University of Montana, Missoula, MT. 646 pp. 



Heidel, B. L. 1996. Montana plant specie of special concern. Unpublished list. Montana Natural 

 Heritage Program, Helena, MT. 3 1 pp. 



. In progress. Botanical survey of Alkali Lake. Unpublished report to U.S. Fish 



and Wildlife Service and Blackfeet Nation. Montana Natural Heritage Program. 



Heidel, B. L., and J. Vanderhorst. 1996. Sensitive plant species surveys, Butte District, 



Beaverhead and Madison Counties, Montana, Bureau of Land Management. Unpublished 

 report to the Bureau of Land Management. Montana Natural Heritage Program, Helena, 

 MT. 



Hitchcock, C. L. and A. Cronquist. 1973. Flora of the Pacific Northwest. University of 

 Washington Press, Seattle, WA. 730 pp. 



Hurd, R. M. 1961. Grassland vegetation in the Big Horn Mountains, Wyoming. Ecology 42(3): 

 459-467 



Johnson, B. L. 1945. Cyto-taxonomic studies in Oryzopsis. Botanical Gazette 107: 1-32. 



Lesica, P. 1994. Sensitive plant survey of BLM lands along the Big Hole River and in the 



Whitehall Valley. Unpublished report to Bureau of Land Management. Montana Natural 

 Heritage Program, Helena. 4 pp. plus appendices. 



Lesica, P. and J. C. Elliott. 1987. Distribution, age structure, and predation of Bitterroot 



milkvetch populations in Lemhi County, Idaho. Unpublished report to the Bureau of Land 

 Management, Boise, Idaho. Conservation Biology Research, Helena, MT. 



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