16 



GEOGRAPHICAL DISTRIBUTION 



1. RANGE: The range of Madia minima extends from 



California to southern British Columbia and then 

 east through northern Idaho to western Montana. 

 Madia minima is currently known from a total of 7 

 locations in western Montana: Sanders (3) , 

 Lincoln (2) , Ravalli (1) , and Missoula (1) 

 counties. The known distribution of the species 

 in Montana is presented in Figure 3, p. 21. 



The three locations in Sanders County occur on 

 hillsides that flank the Bull River valley: Bull 

 River Cliffs (005) , Dry Bench (006) and Goat Rocks 

 (007) . These sites occur on Kootenai National 

 Forest lands. Survey information for these 

 populations is found on pp. 22-24 (Element 

 Occurrence records) . U.S. Geological Survey maps 

 detailing the exact locations of the populations 

 are presented on pp. 25-27. 



E. HABITAT 



ASSOCIATED VEGETATION: In the Bull River valley, 

 Madia minima occurs on rocky, moss covered ledges 

 with sparse vegetative cover. Associated species 

 (at one or more sites) include: 



Calamaqrostis rubescens (pinegrass) 



Clarkia pulchella (ragged robin) 



Collinsia parvif lora (small-flowered blue-eyed 



Mary) 



Epilobium paniculatum (autumn willow-herb) 



Festuca idahoensis (Idaho fescue) 



Heterocodon rarif lorum (western pearl-flower) 



Madia exiqua (little tarweed) 



Mimulus breweri (Brewer's monkey-flower) 



Penstemon lyallii (Lyall's penstemon) 



Selaqinella wallacei (Wallace selaginella) 



All of the sites for M. minima were dominated by 

 small annual species. 



TOPOGRAPHY: Madia minima populations occur on 

 moss covered, rocky outcrops on the steep 

 hillsides that flank the Bull River valley. 

 Populations occupy slopes ranging from 8-35 

 percent, and occur at elevations from 3,000 to 

 3,600 feet. This type of habitat is fairly common 

 on the hillsides flanking the valley. 



