{From the BuLLerin oF THE Torrey Boranicar Crus 47: 45-66. 13 Mr 1920. | 
Notes on Rosaceae—xXIl 
Per AXEL RYDBERG 
ROSES OF NORTHEASTERN NorTH AMERICA 
By northeastern North America is meant the parts of the 
United States and Canada east of the Mississippi River and the 
Lake of the Woods and north of North Carolina and Tennessee. 
It comprises about the same region as that covered by Gray’s 
and Britton’s manuals, except the extreme western portion 
included in the latter. 
As the genus Rosa is too large to be treated in one paper, my 
intention has been to discuss the different species according to 
their distribution, in six or seven articles. One of these articles, 
entitled ‘‘Roses of California and Nevada,’* has already been 
published; the roses of the Rocky Mountain Region have been 
described in my Flora,t and the whole genus, as represented in 
North America, has been monographed in the North American 
Flora.t There is, therefore, no need of giving full descriptions 
or of citing lists of synonyms. For the sake of those who do 
not have access to the later publication, it may be desirable to 
include keys to the species. The articles will otherwise contain 
only such notes as could not be included in the North American 
Flora. 
* Bull. Torrey Club 44: 65-84. . 
tT Flora of the Rocky a ina idincend plains. New York. 1917. 
+N. Am. Flora 22: 483-5 
45 
