D. GEOGRAPHICAL DISTRIBUTION 



1. RANGE: A regional endemic, Astragalus barrii is 

 known from southwest South Dakota (Fall River, 

 Shannon, and Pennington counties) , northeast 

 Wyoming (Campbell, Johnson, Natrona, Niobrara, 

 Sheridan, and Weston counties), and Montana (Big 

 Horn, Carter, Powder River, and Rosebud counties). 

 Within Region 1 of the U.S. Forest Service, it has 

 been located on the Custer National Forest in 

 Montana. 



2. CURRENT SITES: In Montana, Astragalus barrii is 

 recently documented (1975-1988) from 19 sites in 

 Powder River, Rosebud, and Bighorn counties. A 

 historical location is documented for Carter 

 County. The legal descriptions, latitude and 

 longitude, elevations, USGS topographic map names, 

 and locations of sites in Montana are provided in 

 Table 1 pp. 5-9. This table is broken down into 

 sections; where Table 1A contains those sites that 

 occur wholly or partially on U.S. Forest Service 

 lands, and Table IB contains sites that occur on 

 lands of other ownership. A map of the 

 distribution of A. barrii in Montana is shown in 

 Figure 1, p. 10; the exact locations are indicated 

 on the maps provided in Section IV, p. 43. Field 

 surveys were conducted by the author on 13-20 May, 

 1988. 



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 . 



3. HISTORICAL SITES (MONTANA): One location of 

 Astragalus barrii is documented by a voucher 

 specimen cited by Barneby (1964). The existing 

 data on this site is summarized in Section IV, 



p. 46 (Element Occurrence records). Information on 

 this record is incomplete, and only a general 

 location is given. This historical site (Ekalaka 

 (006) record) was unmappable as a specific point, 

 but is marked as occurring on the USGS Ekalaka 

 quadrangle. This historical location is included 

 within the species range in Figure 1. 



