PRYOR MOUNTAINS DESERT DISTRIBUTION: Astragalus geyeri is local and 

 uncommon to abundant below 1525 m (5000 ft) on the south side of the Pryor 

 Mountains. We located seven populations; most were of small or moderate size and 

 occurred in sandy soils of alluvial plains and terraces, usually with Artemisia tridentata . 

 Stipa cdmata and Bouteloua gracilis . 



MANAGEMENT RECOMMENDATIONS: Astragalus geyeri is uncommon or perhaps 

 even rare in the study area. This species is an annual, so population sizes are expected 

 to fluctuate. It can probably tolerate moderate levels of disturbance but may be 

 threatened by encroachment by exotic annuals such as Halogeton glome rat us or Salsola 

 kali . Astragalus geyeri should be given special status on BLM's Miles City District. 



Astragalus gnui Parry 



Gray's Milkvctch 



NATURAL HERITAGE PROGRAM STATUS: G3-G4/S1 



MONTANA STATUS: Sensitive 



GLOBAL DISTRIBUTION: Western Wyoming and adjacent Carbon County, Montana 



MONTANA DISTRIBUTION: Southern Carbon County 



PRYOR MOUNTAINS DESERT DISTRIBUTION: Astragalus gravi is local and 

 uncommon to common below 1370 m (4500 ft) on the west side of the Pryor Mountains 

 in secondary drainages of the Clarks Fork of the Yellowstone River. We located four 

 populations during our study; three of these were small. The species spreads by 

 rhizomes and occurs in silty or clay soils with Artemisia tridentata , A. pedatifida and 

 Agropyron spicatum . 



MANAGEMENT RECOMMENDATIONS: Astragalus grayi is rare in the study area 

 and Montana; only two large populations are known. The effects of livestock grazing on 

 this species are unknown. Populations may be threatened by road construction and oihei 

 developments. This species should be given special status on BLM's Miles City District. 



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