5. Geographical distribution. 



A. Geographical range: A regional endemic, A. barrii 

 is known from 68 locations in southeastern Montana, 

 southwestern South Dakota, and northeastern Wyoming. 



In Montana, A. barrii is currently known from sites 

 in Powder River (19) , Bighorn (2) , and Rosebud (6) 

 counties. There is also one historical record from 

 Carter County that has never been relocated. Within 

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

 located on the Custer National Forest, Ashland 

 District (Montana) . A distribution map of A. barrii 

 populations in Montana is found on p. 10. 



In South Dakota, this species is known from sites in 

 Custer (3), Fall River (3), Shannon (9), and 

 Pennington (6) counties; and in Wyoming from 

 Campbell (4) , Johnson (7) , Natrona (3) , Niobrara 

 (1), Sheridan (1), and Weston (3) counties. 



B. Precise occurrences. 



1. Populations currently known to be extant. 



a. Montana: Information on populations is 

 listed in Occurrence Records, pp. 39-66. 

 Exact locations are provided on USGS 

 quadrangle maps, pp. 67-87. 



2. Populations known or assumed extirpated, 

 a. Montana: None known. 



3. Historically known populations where current 

 status is not known: 



a. Montana: One location of Astragalus 



barrii is documented by a voucher specimen 

 cited by Barneby (1964). The existing 

 data on this site (Ekalaka (006)) is 

 summarized in Occurrence Records, p. 44. 

 Although information on this record is 

 incomplete, and it was unmappable as a 

 specific point, it is plotted on the USGS 

 Ekalaka quadrangle. The location of this 

 historical site is also marked on Map 1, p 

 10. 



4. Locations not yet investigated believed likely 

 to support additional natural populations: 



Much of the appropriate habitat for A. barrii 



