First Report on the Flora of Wyoming. 65 



Scrub Oak {(luerciis iindtdata) 

 Wild Plum {Primus Americana). 

 Wild Cherry {Prumcs demtssa). 

 Wild Cherry {Prtinus P'irginiana). 

 Hawthorn (^Cratcegus rivularis). 

 Hawthorn {Cratagus Doi/g/asii). 

 Service Berry {Amelaiichier alttifolid). 



( Eleag n us argen tea ) . 

 Buftalo Berry {Shepherdia argented). 

 Black Birch {Betula occiden/a/is). 

 Black Alder {A/nus incaiia virescetts). 

 Sage Brush [Artemisia tridentata). 



In a few localities of the state occasional specimens 

 of Sage Brush attain a remarkable size- — small trees in fact 

 — so that a man on horseback may ride erect underneath 

 the branches. 



Other species have been reported but until the speci- 

 mens are at hand they will not be listed. The number of 

 shrubby plants is so great that to list them separately 

 would be to reprint a large part of the succeeding sys- 

 tematic list. 



THE FLORAS OF THE PACIFIC AND THE ATLANTIC 

 SLOPES. 



I have had no opportunity to compare the floras of 

 the two regions except in so far as the plants on the wes- 

 tern side of the Wind River range and those of Jackson's 

 Hole and the Tetons, all of which are on the Pacific slope, 

 may be compared with those on the eastern side of the 

 Wind River Mountains and those of the south-eastern 

 part of the state, which represent the Atlantic slope. 

 Such examination has led to the conclusion that the con- 

 tinental divide, though dividing the waters, does not sep- 

 arate floras. The two regions have a far larger number 



