P are affected by climate and predation. It appears that A^ 



scaphoides is able to persist with current levels of predation 

 and under the present climatic regime. 



LITERATURE CITED 



Cabin, R. J., J. Ramstetter and R. E. Engel. 1991. Reproductive 

 limitations of a locally rare Asclepias . Rhodora 93: 1-10. 



Ehrlen, J. 1992. Proximate limits to seed production in a 

 herbaceous perennial legume, Lathyrus vernus . Ecology 73: 1820- 

 1831. 



Greig-Smith, J and G. R. Sagar. 1981. Biological causes of 

 local rarity in Carlina vulgaris . In H. Synge (ed.) The 

 biological aspects of rare plant conservation. John Wiley and 

 Sons, New York. 



Harper, J. L. and H. L. Wallace. 1987. Control of fecundity 

 through abortion in Epilobium montanum L. Oecologia 74: 31-38. 



Heinrich, B. 1975. Energetics of pollination. Annual Review of 

 Ecology and Systematics 6: 139-170. 



^ Hester, M. W. and I. A. Mendelssohn. 1987. Seed production and 



germination response of four Louisiana populations of Uniola 

 paniculata (Gramineae) . American Journal of Botany 74: 1093- 

 1101. 



Hutchings, M. J., K. D. Booth, and S. Waite. 1991. Comparison 

 of survivorship by the- logrank test: criticisms and alternatives. 

 Ecology 72: 2290-2293. 



Lesica, P. 1987. A technique for monitoring non-rhizomatous, 

 perennial plant species in permanent belt transects. Natural 

 Areas Journal 7: 65-68. 



Lesica, P. and J. C. Elliott. 1987. Distribution, age 

 structure, and predation of Bitterroot milkvetch populations in 

 Lemhi County, Idaho. Report submitted to the Bureau of Land 

 Management, Boise, Idaho. 



Lesica, P. and J. C. Elliott. 1989. 1988 monitoring study of 

 Bitterroot milkvetch populations in Lemhi County, Idaho. Report 

 submitted to the Bureau of Land Management, Boise, Idaho. 



Lesica, P. and J. S. Shelly. 1991. Sensitive, threatened and 

 endangered vascular plants of Montana. Montana Natural Heritage 

 Program Occasional Publication No. 1, Helena. 



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