PREFACE. xi 



be better known, many plants not included in this catalogue will 

 doubtless be found, especially those from the prairie region which 

 have spread into the state along the water courses. The flora of a 

 small portion of the extreme northwestern corner around the Kootenay 

 River is also unknown. In fact, it is onl}^ the mountain regions that 

 have been fairly well explored. 



Only new species or varieties are fully described, but as the de- 

 scriptions of many others are not accessible to the general public, I 

 have indicated the essential characters of all species not contained 

 in Coulter's Manual, together with other notes, principally on distribu- 

 tion and altitude. Under each species is given the original place of 

 publication and such references as have bearing upon the nomen- 

 clature. 



In abbreviating titles to books the rules adopted by the Madison 

 Botanical Congress have been followed with the few exceptions 

 noted below. For the benefit of those not having access to any of 

 the larger botanical libraries, references have been added in brackets 

 to the most commonly used manuals where descriptions may be 

 found ; for these references it has been thought best to shorten the 

 titles more than usual, as they occur so frequently, and the following 

 forms were chosen : 



" Man. R. M.," Coulter, Manual of the Rocky Mountain Region. 

 " Bot. Cal.," Brewer & Watson, Botany of California. 

 "111. Fl.," Britton & Brown, Illustrated Flora. 

 "Syn. FL," A. Gray, Synoptical Flora. 



P. A. Rydberg. 

 New York Botanicai, Garden, February 15, 1900. 



