METHODS 



On the basis of existing floristic information, a list of 

 rare plants known or suspected to occur in the Bull River valley 

 was prepared. Species included were: 



Cirsium brevistvluV (short-styled thistle) 



* Allium f ibrillum (fringed onion) 

 Brasenia schreberi (water-shield) 



* Calamaqrostis tweedyi (cascade reedgrass) 



* Clarkia rhomboidea (common clarkia) 



* Cvpripedium calceolus var. oarviflorum (small yellow 

 lady 's-slipper) 



* Geocaulon lividum (northern bastard toad-flax) 

 Halenia deflexa (spurred gentian) 



* Howellia aquatilis (water howellia) 

 Lilium columbianum (tiger lily) 



* Lomatium qeyeri (Geyer's biscuit root) 

 Madia minima ^ (small-head tarweed) 

 Rubus ursinus (Pacific blackberry) 



* Satureia douglasii (yerba buena) 

 Spiraea x pyramidata (pyramidal spiraea) 



* = Region 1 sensitive species 



^ = taxa previously recorded in the Bull River drainage 



Ocular reconnaissance was used to locate potentially rare 

 plant species during searches in the Bull River valley and 

 surrounding areas. Owing to the extent of the area to be covered 

 and the time constraints, the most likely habitats for these 

 species were searched in detail, 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 were collected 

 for several areas. 



The first section of this report includes information 

 pertaining to the rare plant species that were found to occur on 

 Forest Service lands: Lomatium bicolor var. bicolor . Madia 

 minima, Heterocodon rariflorum, and Spiraea x pyramidata. 

 Although none of these species are currently on the U.S. Forest 

 Service Region 1 (Northern Region) sensitive species list, they 

 are on the Montana Natural Heritage Program list of plant species 

 of special concern for Montana. The reports emphasize 

 information on populations found in the Bull River valley. The 

 numbers in parentheses following the site names refer to the 

 Natural Heritage Program Element Occurrence Record for that 

 location (records are found at the end of the respective sections 

 for each species) . 



