Page No. 



42a. Mature plants often arborescent 



(with single trunklike main stem) , 

 usually from 1 to 2 m but in some 

 forms up to 4.5 high; leaves 

 narrowly lanceolate with margins 

 not curving outward; average per- 

 sistent 5,6 times its width; 

 blooming starts in late August or 

 September; odor strongly pungent; 

 normally occurs below 2,100 m in 

 dry deep, well-drained soils on 

 plains, valleys, and foothills 



A. tridentata 



ssp. tridentata 30 

 (basin big sagebrush) 



42b. Mature plants with several main 

 branches usually less than 1 m 

 high; leaves narrowly cuneate to 

 cuneate with margins curved out- 

 ward; average persistent leaf 

 length is 3.1 times its width; 

 blooming starts in late July or 

 August, odor pungent; occurs 

 on dry, shallow, gravelly soil 

 from 1,500 to 2,100 m 



A. tridentata 



ssp. Wyoming ensis 33 

 (Wyoming big sagebrush) 



41b. Plants usually even-topped shrubs with 

 flower stalks arising from upper crown 

 portions; leaves broadly cuneate to 

 spatulate; average persistent leaf 

 length is 4.0 times its width; blooming 

 may begin in July; odor slightly pun- 

 gent to pleasantly mintlike; occurs 

 from 1,400 to 3,000 m in deep well- 

 drained soils A. tridentata 



ssp. vaseyana 31 

 (mountain big sagebrush) 



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