40 Wyoming Experiment Station. 



three feet high, and with long leaves from an eighth to one- 

 fourth of an inch broad. Common in rocky ravines in the foot- 

 hills of Albany county. 



Desert Rabbit-bush (Chrysothamnus linifolius Greene). 



An erect shrub, two to five feet high, occurring on moist al- 

 kali flats in the Red Desert and adjacent localities. Its trusses 

 of flowers are flat-topped, and its leaves are shorter but as 

 broad as those of the preceding. 



Strong-scented Rabbit-bush (Chrysothamnus graveolens 

 (Nutt.) Greene). 

 This and the three following are very similar, being two to 

 several feet high and having yellowish stems and very narrow 

 (linear) leaves one and a half to three inches long. This spe- 

 cies has large flat-topped trusses of flowers and its leaves are 

 not at all hoary. It is common in eastern Wyoming. 



Rock Rabbit-bush (Chrysothamnus oreophilus Aven Nelson). 

 Like the preceding, but the flower clusters smaller and not as 

 flat-topped and its green leaves are less than two inches long. 

 It occurs in the southern part of Uinta county. 



Ornamental Rabbit-bush (Chrysothamnus pulcherrimus 

 Aven Nelson). 

 This rabit-bush has long hoary leaves and stout erect 

 branches terminated by large trusses of light-yellow flowers. 

 It is common in southern and western Wyoming. 



Wyoming Rabbit-bush (Chrysothamnus Wyomingensis Aven 

 X el son). 

 Fewer-flowered and leaves less hoary than in the preceding. 

 Its flowers are arranged along the upper part of the branches. 

 This species is widely distributed in the state. 



Hoary Rabbit-bush (Chrysothamnus Plattensis Greene). 



Very low and seldom over a foot high. It has yellowish 

 stems and hoary-gray leaves. It is very common on the high 



