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b. POLLINATION BIOLOGY: Unknown. 



c. SEED DISPERSAL AND BIOLOGY: Unknown. 

 G. POPULATION ECOLOGY 



1. BIOLOGICAL INTERACTIONS 



a. COMPETITION: This small annual was found in 

 somewhat barren soils, and it is possible 

 that is does not compete well. 



b. HERBIVORY: Unknown. 



H. LAND OWNERSHIP 



1. U.S. Forest Service - Kaniksu National Forest, 

 managed by the Kootenai National Forest: 



Dry Bench (001) 



Bull River Cliffs (002) 



II. ASSESSMENT AND MANAGEMENT RECOMMENDATIONS 



A. THREATS TO CURRENTLY KNOWN POPULATIONS: 



1. GRAZING: Not observed and unlikely in its native 

 habitat in the Bull River valley. 



2. MINING: Unknown. 



3. TIMBER HARVESTING: Although H. rariflorum appears 

 to require bare soil for germination, it is not 

 known how it would respond to timber harvests. 



/ 



4. WEED CONTROL ACTIVITIES: Spraying of H. 

 rariflorum populations would be detrimental unless 

 they had gone to seed. 



B. MANAGEMENT PRACTICES AND RESPONSE: Unknown. 



C. RECOMMENDATIONS FOR MAINTAINING VIABLE POPULATIONS: 

 The locations of the known populations on the Kootenai 

 National Forest are in areas that are unlikely to be 

 affected by most management practices, and the 

 populations are probably self-maintaining. 



D. RECOMMENDATIONS FOR FURTHER ASSESSMENT: There is 

 additional habitat along the Bull River drainage that 

 might potentially contain populations of H. rariflorum , 



