V. LITERATURE CITED 



Achuff, P.L. and J.S. Shelly. 1991. Demographic monitoring of 

 Penstemon lemhiensis, Beaverhead National Forest, 1990 

 progress report. Montana Natural Heritage Program, Helena. 

 34 pp. 



Massey, J.R. and P.D. Whitson. 1980. Species biology, the key to 

 plant preservation. Rhodora 82: 97-103. 



Shelly, J.S. 1990. Status review and establishment of demographic 

 monitoring studies: Penstemon lemhiensis . Montana Natural 

 Heritage Program report to Be< verhead and Bitterroot 

 national forests, Montana. 61 pp. 



U.S. Department of the Interior. 1990. Endangered and threatened 

 wildlife and plants; review of taxa for listing as 

 endangered and threatened species; notice of review. Federal 

 Register 50 CFR Part 17: 6184-6229. 



