III. LITERATURE CITED 



Dorn, R. D. 1977. Manual of vascular plants of Wyoming. Garland Publishing, New 

 York. 



Dorn, R. D. 1988. Vascular plants of Wyoming. Mountain West Publishing, Cheyenne, 

 Wyoming. 



Faegri, K. and L. van der PijI. 1971. The principles of pollination ecology . Pergamon 

 Press, Oxford. 



Hitchcock, C. L., A. Cronquist, M. Ownbey and J. W. Thompson. 1964. Vascular Plants 

 of the Pacific Northwest. Part 2: Salicaceae to Sa.xifragaceae. University of 

 Washington Press, Seattle. 



Knight, D. H.. G. P. Jones. Y. Akashi. R. W. Myers. 1987. Vegetation ecology in the 

 Bighorn Canyon National Recreation Area. Unpublished report submitted to 

 Bighorn Canyon National Recreation Area. Fort Smith. Montana. 



Lesica. P. and J. S. Shelly. 1991. Sensitive, threatened and endangered vascular plants 

 of Montana. Montana Natural Heritage Program. Occasional Publication .No. I. 

 Helena, Montana. 



Lesica. P. and P.L. Achuff. 1992. Distribution of vascular plant species of special 



concern and limited distribution in the Pryor Mountain Desert. Carbon County. 

 Montana. .Montana Natural Heritage Program report to the Bureau of L;md 

 Management, Billings, Montana. 



Lichvar. R. W.. E. I. Collins and D. H. Knight. 1984. Checklist of vascular plants for the 

 Bighorn Canyon National Recreational Area. Report prepared for University of 

 Wyoming - National Park Ser\'ice Research Center. Laramie. 



Mack, R. N. 1981. Invasion of Bromus tectorum L. into western North America: an 

 ecological chronicle. Agroecosystems 7: 145-165. 



.National Oceanic and Atmospheric Association. 1982. Monthly normals of temperature, 

 precipitation and heating and cooling degree days. Montana, 1951-1980. National 

 Climate Center, Ashville, North Carolina. 



Reveal, J. L. 1967. Notes on Eriogonum - III: On the status of Eriogonum paucitlorum 

 Pursh. Great Basin Naturalist 27: 102-117. 



Rydberg, P. A. 1917. Flora of the Rocky Mountains and adjacent plains. New York 

 Botanical Garden, Bronx, New York. 



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