32b. Plants with decumbent, frequently layer- 

 ing branches; leaves often 3 cm long, 

 deeply cleft into 3 linear lobes; rocky 

 knolls from 2,430 to 2,740 m in central 

 and southeastern Wyoming to southern 



Oregon A. tripartita 



ssp. rupicola 

 (Wyoming threetip sagebrush) 



31b. Plants low from 2 to 5 dm high (but may be less). 



33a. Heads axillary and sessile, generally all 

 surpassed by their subtending leaves; 

 leaves deeply divided into 3 to 5 

 narrowly linear lobes; deciduous 



A rigida 20 



(stiff sagebrush) 



33b. Heads usually in branched racemose 



panicles or if spikelike, then subtending 

 leaves do not surpass heads; leaves 3- 

 to 5-toothed or lobed, cuneate to fan- 

 shaped, persistent. 



34a. Leaves broadly cuneate, deeply 3-lobed 

 involucre broadly companulate; flower 

 heads 3 to 5 mm broad with 6 to 11 

 disc flowers; blooming begins in mid- 

 June; seeds 2.5 mm long, ripening in 

 August; adapted to heavy, highly 

 impermeable, alkaline soils from 1,800 

 to 2,450 m from southwestern Montana 

 to northwestern Colorado, Utah, 

 Nevada, Idaho, and Oregon 



A longiloha 16 



(alkali sagebrush) 



34b. Leaves cuneate to broadly cuneate or 

 fan-shaped, 3- to 5-toothed or cleft; 

 involucre narrowly campanulate; flower 

 heads and seed smaller than above; 

 blooming normally occuring later than 

 July; seed ripen late September and 

 October. 



35a. Leaves cuneate, 3-toothed (upper 

 leaves may be entire), viscid; 

 heads arranged in narrow spikelike 

 panicles; disc flowers 3 to 5 per 

 head; corollas 1.8 to 3 mm long; 

 involucral bracts glabrous or nearly 

 so; plants usually dark green with 

 persistent red-brown inflorescent 

 stalks; occurs on dry, shallow, 

 rocky soil between 1,500 and 

 2,400 m in most western States 



A. nova 17 



(black sagebrush) 



Fage No. 



35 



79 



