Potential : 



Aqoseris lackschewitzii (pink agoseris) 



Cirsium subniveum (Jackson's Hole thistle) 



Eriqeron asperugineus (rough fleabane) 



Juncus hallii (Hall's rush) 



Polystichum kruckebergii (Kruckeberg ' s sword-fern) 



Salix wolfii var. wolf ii (Wolf's willow) 



Saussurea weberi (Weber's saw-wort) 



Ocular reconnaissance was used to locate potentially rare plant 

 species during searches in the Pioneer Mountains. Owing to the 

 extent of area covered and times constraints, searches of known 

 species were initiated by relocating and verifying old sites, 

 while other areas were covered as time allowed. 



Field collections were identified using Flora of the Pacific 

 Northwest (Hitchcock and Cronquist 1973) , Vascular Plants of the 

 Pacific Northwest (Hitchcock et al. 1955-1969) , and Vascular 

 Plants of Montana (Dorn 1984). Voucher specimens are deposited 

 at the University of Montana Herbarium (MONTU) and Florida State 

 University Herbarium at Tallahassee. 



Throughout this report, the three-digit occurrence numbers are 

 indicated in parentheses after the site names; these correspond 

 to the occurrence numbers provided in the tables and computer 

 print-outs. 



RESULTS 



Field surveys completed in 1990 for the historical locations of 

 both Saxif raqa tempestiva at Waukeena Lake, and Selaqinella 

 watsonii at Comet Mountain, were unsuccessful. The scant 

 information available for the Saxifraqa tempestiva location comes 

 from an undated specimen collected by Hitchcock and Muhlick, 

 which was probably collected the late 1940 's or early 1950 's. 

 The limited information on the Selaqinella watsonii population at 

 Comet Mountain is from a specimen collected in 1921. These plant 

 populations may still exist since the areas are remote enough to 

 be little changed since the last observation. More extensive 

 field surveys are needed to ascertain the existence and exact 

 locations of these two populations. 



No new populations of Claytonia lanceolata var. f lava were 

 located during this survey. Existing populations are documented 

 in a status report by Shelly (1989). Of the plants with 

 potential to occur in Pioneer Mountains, only a single population 

 of C. subniveum was located during this survey. Individual 

 reports for the relocated populations of Haplopappus macronema 

 var. macronema . Mimulus primuloides , and for the new population 

 of Cirsium subniveum are detailed below. 



