21 



III. LITERATURE CITED 



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 sericoleucus Gray and its immediate relatives. American 

 Midi. Nat. 55: 504-507. 



Barneby, R.C. 1964. Atlas of North American Astragalus. 



Memoirs of the New York Botanical Garden 13: 1143-1156. 



Bergantino, R.N. 1980. Geologic Map of the Hardin 1x2 



Quadrangle, Southwestern Montana, Atlas 2-A. Montana Bureau 

 of Mines and Geology. 



Lesica, P., Moore, G., Peterson, K.M., and J.H. Rumely 1984. 

 Vascular Plants of Limited Distribution in Montana. 

 Monograph No. 2, Montana Academy of Sciences, Supplement to 

 the Proceedings, Vol. 43. 61 pp. 



Locklear, J. Autumn 1986. On the trail of Barr's milkvetch, 

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Ode, D.J. 1984. Letter dated 14 August to J.L. Miller, Office 

 of Endangered Species. 



Ode, D.J. 1988. Four endemic plants of the Northern Great 



Plains. Proceedings of the North Dakota Academy of Science, 

 42:7 (abst) . 



Roberts, M.L. 1977. Systematics of the Orophaca Astragali. 

 M.S. Thesis, University of Wyoming, Laramie, WY. 101 pp. 



Shelly, J.S. 1987. Plant Species of Special Concern. Montana 

 Natural Heritage Program, Helena. 12 pp. 



U.S. Department of Agriculture 1988. Sensitive Plant Field 



Guide to Northern Idaho and Montana. U.S. Forest Service, 

 Northern Region, Range, Air, Watershed, and Ecology. 

 Missoula, Montana. 



U.S. Department of Commerce 1982. Monthly Normals of 



Temperature, Precipitation, and Heating and Cooling Degree 

 Days 1951-80. National Oceanic and Atmospheric Administra- 

 tion, Climatography of the United States No. 81. 23 pp. 



U.S. Department of Interior, Fish and Wildlife Service 1985. 

 Endangered and threatened wildlife and plants: Review of 

 plant taxa for listing as endangered or threatened species. 

 Federal Register 50(188): 39526-39584. 



