8a. Twigs glabrous or finely puberulent. 



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9a. Flowers white; leaves glabrous with copius resinous 

 exudate, surface with small pits; alkaline areas 

 from western Utah to eastern California... C. albidus 39 



(alkali rabbitbrush) 



9b. Flowers pale to dark yellow; leaves not as above. 



10a. Achenes glabrous, or glandular only at distal end. 



11a. Involucral bracts 5 to 7 mm long, with thick 



greenish apical tips, not strongly alined into 



ranks C. vaseyi 53 



(Vasey rabbitbrush) 



lib. Involucral bracts 10 to 13 mm high, lacking 

 thick greenish apical tips, strongly alined 



into 5 vertical ranks C. depressus 39 



(dwarf rabbitbrush) 



10b. Achenes densely pubescent. 



12a. Involucral bracts with narrowly acuminate, 



greenish tips C. greenei 41 



(Greenes rabbitbrush) 



12b. Involucral bracts acute to obtuse. 



13a. Heads somewhat turbinate, 5 to 6 



flowered, shrubs large, up to 2.4 m 

 tall; leaves 4 to 8 mm wide; involucral 

 bracts thick with conspicuous green 

 spots near obtuse apex... C. linifolius 42 

 (spreading rabbitbrush) 



13b. Heads narrowly cylindric, 3 to 5 

 flowered; shrubs various; leaves 

 often twisted, 1 to 6 mm wide 



C. visoidiflovus 



complex 54 

 (low rabbitbrush) 



14a. Leaves and upper stems glabrous. 



15a. Shrubs usually over 5 dm 

 tall, leaves 1 to 5 mm 

 wide, 2 to 5 cm long; 

 usually with very pungent 



odor C. viscidif torus 



ssp. viscidif torus 57 

 (stickyleaf low rabbitbrush) 



15b. Shrubs less than 5 dm tall; 

 leaves 1 mm wide, 1 to 3 cm 

 long, filiform; odor various 



C. viscidiftorus 



ssp. stenophyttus 57 

 (narrowleaf low rabbitbrush) 



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