58 Muhlenbergia, Volume 8 



canyon. It was distributed as '•'•Aster glacialis Nutt.," but is 

 probably not that species, and does not seem to agree with any 

 of those recently described by Greene, Leaflets 3: 197-206. 



The trip to Rattlesnake canyon was the last one, and though 

 it yielded a comparatively small number of species, nearly all of 

 them were of considerable interest. 



During the six weeks spent on and about the Ruby moun- 

 tains 552 numbers were collected. The entire range would no 

 doubt yield not less than a thousand species if it were thoroughly 

 explored. A number of species had undoubtedly bloomed and 

 disappeared from the lower slopes, while the summits of the 

 highest peaks should harbor many more. It is pretty certain 

 that nearly every canyon contains a few species not found in 

 adjacent ones. This I think can be shown by a comparison of 

 the flora of Rattlesnake canyon with that of the middle canyon 

 of the South Fork, separated by but one canyon, their heads 

 close together. 



While the greater number of the species found here seem 

 to belong to the Rocky mountain flora, some few are local, and 

 a small number are identical with species whose home is in the 

 Sierra Nevada 350 miles to the westward, with no range of sim- 

 ilar character intervening. The peculiar thing is that practi- 

 cally none of these species are found northward where the moun- 

 tain systems merge more or less. 



