20 



The Jerry Creek population (007) is 

 threatened by grazing and trampling by 

 cattle. The lower portion of the hill where 

 this population occurs was heavily trailed 

 and disturbed. 



11.12. General assessment of vigor, trends and 



status: Arabis fecunda is now know from 

 twelve populations, within a radius of ca . 47 

 miles. Centaurea maculosa (spotted knapweed) 

 is currently not a threat to populations 

 along the flanks of the Pioneer Range, but 

 may pose a threat to the Birch Creek Bluffs 

 site in the foothills of the Sapphire Range. 

 Reproductive output and vigor of Arabis 

 fecunda appears to be normal at the newly 

 discovered sites. 



II. 13. A. Recommendation to U.S. Fish and Wildlife 



Service: Peter Lesica submitted a petition 

 to list Arabis fecunda just prior to the 

 discovery of the new populations along the 

 flanks of the Pioneer Mountains. Subsequent 

 to these discoveries the petition was 

 retracted. It is recommended that Arabis 

 fecunda be retained in Category 2 until 

 further distribution and ecological studies 

 can be conducted. 



II.13.B. U.S. Forest Service: Arabis fecunda is now 

 known to occur on lands administered by the 

 U.S. Forest Service. Thus, it should be 

 placed on the list of sensitive species in 

 Region 1 for Montana. 



II. 15. A. 1. Recommendations regarding present or 



anticipated activities: The effects of 

 mining or increased grazing in areas 

 supporting populations of Arabis fecunda 

 should be assessed before any of these 

 activities are implemented. 



2. Areas recommended for protection: The Vipond 

 Park site (Oil) is a large, representative 

 population of Arabis fecunda on Forest 

 Service lands, and should be proposed for 

 special designation. The Quartz Hill site 

 (005) , although not yet thoroughly surveyed, 

 is recommended for protection because of its 

 close proximity to two other rare plant 

 populations ( Penstemon lemhiensis (Lemhi 

 penstemon) and Claytonia lanceolata var. 

 f lava (yellow springbeauty ) ) , Both of these 



