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F. POPULATION DEMOGRAPHY AND BIOLOGY 



1. POPULATION SIZE AND CONDITION: Past element 



occurrences were located for Senecio debilis including 

 many new locations. The populations seems to be stable 

 to increasing in numbers. 



6. REPRODUCTIVE BIOLOGY: Senecio debilis reproduces by seeds 

 resulting in a perennial plant. 



H. LAND OWNERSHIP: Senecio debilis p opulations were located 

 on both BLM and private lands. 



II. ASSESSMENT AND MANAGEMENT RECOMMENDATIONS 



A. THREATS TO KNOWN POPULATIONS: Populations of Senecio 

 debilis appear to be stable at this time. Observations 

 made in the Tendoy Mountains indicate that this species 

 persists or increases under some level (s) of grazing 

 (Vanderhorst and Lesica, in progress) . 



B. FURTHER ASSESSMENT AND MANAGEMENT NEEDS: None identified. 



C. SUMMARY: Senecio debilis is a Great Basin species 

 that is found recurrently is alkaline meadows of 

 Beaverhead County. Its number of populations and reported 

 persistence (Vanderhorst and Lesica, in progress) under 

 grazing provide basis for recommending that it be dropped 

 from further consideration by BLM as a sensitive species. 



