between rocky steep upper slopes and nearly level benches along 

 drain age ways. 

 B. Physical characteristics 



1. Climate 



a. Koppen Climate Classification—Unknown. 



b. Regional macroclimate--Cl imate of the area in which A. 

 scaphoides occurs ( Artemisia - Agropyron shrubland) is 

 described by Weaver (1980, Amer. Midi. Nat. 103:392). July 

 mean is 66°F. January mean is 19°F. Mean annual 

 precipitation is 13 inches, with an average drought period 

 of 2.0 months. 



c. Local microclimate--No information available. Populations 

 ususally occur on warm aspects. 



2. Air and water quality requirements—Not known. 



3. Physiographic province—Northern Rocky Mountain Province (Hunt 

 1967). 



4. Physiographic and topograhic characteri sti c— Astragal us 

 scaphoides occurs between 5,000 and 6,500' at all locations 

 except the Shoup site. Populations generally occur on lower 

 slopes at the base of fairly steep hills. A. scaphoides seems 

 to be most abundant on warmer aspects - south and southwest 

 being most common. 



5. Edaphic factors— Soil s are generally silty in texture with 

 moderate to large amounts of coarse fragments. Parent 

 materials are basalt, diabase, and limestone. 



6. Dependence on dynamic factors— Unknown. 



7. Other unusual physical features of environment and 

 habitat — None. 



5 



