B. Precise occurrences 



(In this report, three-digit occurrence numbers 

 are listed in parentheses after site names to 

 indicate the occurrence numbers provided in the 

 tables, element occurrence listings and maps.) 



1. Populations currently known to be extant: 



Table 1 lists all populations currently 

 known. 



2. Populations known or assumed extirpated: 



None. 



3. Historically known populations where current 

 status is not known: None. 



4. Locations not yet investigated believed 

 likely to support additional natural 

 populations: The alpine and timberline flora 

 in the Bitterroot Mountains has been 

 exhaustively studied by Lackschewitz (1970, 

 1986) . The major summits and areas explored 

 in the earlier studies include Lolo, Sweeney, 

 St. Mary, St. Joseph, East St. Joseph, 

 Trapper, Bass, Ranger, Boulder, Bare, 

 Watchtower, and West Como peaks. Pyramid 

 Buttes, Gash Point, Glen Lake Mtn . , Blodgett 

 Mtn., Ward Mtn., Lost Horse Mtn., El Capitan, 

 Chaff in Creek Headwater Basin, and Mt. 

 Jerusalem. In discussing the possible 

 locations where L. humilis might additionally 

 be found, Lackschewitz (pers. comm.) 

 recommended detailed surveys in two areas. 



In a note to the junior author, he wrote 

 "...I suspect it to occur on Gash Point. . .but 

 have never collected it anywhere s. of St. 

 Mary's." He also suggested that Sweeney Peak 

 should be surveyed. Sweeney Peak and Gash 

 Point were studied in detail in 1987, and 

 Sweeney and Lolo peaks were surveyed in 1990. 

 All areas of suitable habitat were 

 intensively searched but, as in the earlier 

 field research, L. humilis was not located on 

 or near any of these summits. Other peaks in 

 the Bitterroot Range may support populations 

 of L. humilis but considerable searching has 

 not revealed any. 



6. Locations known or suspected to be erroneous 

 reports: None known. 



