4. BIOLOGICAL INTERSECTIONS 



a. COMPETITION: Rabbit-tobacco was found in a sparsely-vegetated 

 site, suggesting that this annual does not tolerate competition. 



b. HERBIVORY: None apparent. 



c. FIRE: Not applicable. 

 G. LAND O^VNERSHIP (MONTANA) 



a. USDA - Agricultural Research Service - Fort Keogh (001) 



b. USDA - Custer National Forest (002) 



H. ASSESSMENT AND MANAGEMENT RECOMMENDATIONS 



1. THREATS TO CURRENTLY KNOWN POPULATIONS: No threats are 

 knovkTi, but with only a single brief site visit, data are inadequate for 

 assessment. The area was being grazed at the time of the site visit. 



2. MANAGEMENT PRACTICES AND RESPONSES: Unknown. 



3. RECOMMENDATIONS FOR MAINTAINING VIABLE 

 POPULATIONS: None currently. 



4. RECOMMENDATIONS FOR FURTHER ASSESSMENT: Systematic 

 surveys for this species are warranted. Additional data on population trends 

 would also be useful, involving periodic site visits throughout the growing 

 season over a course of several years. 



SUMMARY 



The flora of southeastern Montana is very poorly known, and it is not currently possible to 

 determine the rarity of Evax prolifera documented for the first time in the state. 



76 



