28 



III. LITERATURE CITED 



Dorn, R.D. 198^. Vascular Plants of Montana. Mountain Press 

 Publishing, Cheyenne, Wyoming. 276 pp. 



Pierce, J., W. Hann, and W. Ruediger. 1987. Federally listed 

 vascular plant species and proposed sensitive plant species 

 list for the Northern Region (draft). U.S. Forest Service, 

 Missoula, Montana. 33 pp. 



Ramstetter, J. 1983. An ecological study of the regional 



endemic Penstemon lemhiensis (Keck) Keck & Cronq. 



(Scrophulariaceae) . M.A. Thesis, University of Montana, 

 Missoula. 116 pp. 



Rollins, R.C. 198^. Studies in the Cruciferae of western North 

 America II. Contr. Gray Herb. 21^: 1-18. 



Rollins, R.C, and E.A. Shaw. 1973. The Genus Lesquerella 

 (Cruciferae) in North America. Harvard University Press, 

 Cambridge, Massachusetts. 288 pp. 



Shelly, J.S. 1986. Report on the conservation status of 



Grindel ia howel 1 i i , a candidate threatened species. 



Unpublished report to U.S. Fish and Wildlife Service, 

 Denver, Colorado. 139 pp. 



Shelly, J.S. 1987. Status review of Penstemon lemhiensis , U.S. 

 Forest Service - Region 1, Beaverhead and Bitterroot 

 National Forests, Montana. Unpublished report to U.S. 

 Forest Service, Missoula, Montana. 72 pp. 



Shelly, J.S. 1988. Plant species of special concern. Montana 

 Natural Heritage Program, Helena. 12 pp. (mimeo). 



Shelly, J.S., and P. Lesica. 1986. Sensitive plant species, 

 U.S. Forest Service - Region 1, Montana. Unpublished report 

 to U.S. Forest Service, Missoula, Montana. 31 pp. 



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

 Temperature, Precipitation, and Heating and Cooling Degree 

 Days 1951-80. National Oceanic and Atmospheric 

 Administration, CI imatography of the United States No. 81. 

 23 pp. 



