Vegetative material at four locations was unable to be definitively identified as 

 A. barrii. Because these sites are remote from the known populations, 

 confirming their identity is necessary for understanding species distribution on 

 the District. Tliree populations previously identified as A. barrii based on 

 vegetative material need clarification in light of the A. hyalinus discovery. The 

 seven undetemiined sites follow: 



Bloom Creek in Pow^der River County (034) 

 Drop Tube Reservoir of Powder River County (033) 

 Lyon Creek Ridge of Powder River County (014) 

 North Bloom Creek in Powder River County (032) 

 NW Buttress in Powder River County (017) 

 Wilbur Creek in Powder River County (036) 

 Sheep Well Road in Powder River County (020) 



Seven additional prospective populations were noted in vegetative condition 

 and later visited by David Sclinioller who found flowering A. hyalinus: 



Camps Pass in Powder River County 



East Fork Drainage in Powder River County 



Erickson Spring in Powder River County 



O'Dell Creek in Rosebud County 



Slough Grass Reservoir 



South Fork of Poker Jim Creek in Rosebud County 



Tenmile Creek in Powder River County (with aberrant A. hyalinus) 



D. HABITAT - The following text is elaborated from Schassberger (1990). 



1. ASSOCIATED VEGETATION: A \try s^arszcovQX of Pinus ponder osa 



(ponderosa pine) oxJuniperus scopulorum (Rocky Mountain juniper) is found 

 at some locations, but often only a sparse shrub cover of Artemisia tridentata 

 (big sagebrush) and/or Atriplex confertifolia (shadscale) is present. Vegetative 

 cover of grasses and forbs at these sites is low, with few dominant species 

 (Appendix E-3). 



All but one of the sites in southeastern Montana occur in the Clayey and 

 Shallow Clay Range Site Association (Ross and Hunter 1976). This 

 association is described as occurring in the 10-14 inch precipitation zone with 

 dominants western and thickspike wheatgrass, green needlegrass, little 

 bluestem, bluebunch wheatgrass, prairie junegrass, native legumes, big 

 sagebrush, Nuttall saltbush, and winterfat. 



In the Custer National Forest, associated species are: 



22 



