construction of reserviors has provided an unusual increase 

 in potential habitat for this species, at least in Wyoming 

 (Rollins 1993) . There is no basis for addressing potential 

 threats in Montana. It was noted that the Garfield County 

 site of this species is heavily grazed by sheep and has a 

 long history of grazing by sheep. 



2. MANAGEMENT PRACTICES AND RESPONSE: Management of reservior 

 water levels are of major management significance for this 

 species in Wyoming. 



SUMMARY: The Persistentsepal yellowcress ( Rorippa calycinia ) has 

 been proposed by Wyoming botanists for deletion from 

 consideration as a candidate for federal listing under the 

 Endangered Species Act in light of the large, dispersed number of 

 known Wyoming populations and their contemporary preponderance 

 for reserviors (Fertig pers. commun.). It is an extremely rare 

 species in Montana from all available information and is 

 appropriately given watch status by the BLM in the Big Dry, 

 Billings, Judith, Powder River and Great Falls Resource Areas. 

 The three historic records are unrelocatable ; and the two recent 

 records are possibly extirpated. 







