Rydberg: Notes on Rosaceae 539 



and vS*. densiflora, to the Siberian S. betulifolia. Dr. E. L. Greene 

 apparently was the first one to point out that the Alaskan species 

 differed from all the other North American relatives in having 

 reflexed sepals. As this is a character found in the original S. 

 betalifolia he removed from that species all but the Alaskan plant. 

 The latter, however, differs considerably from Pallas's figure of 

 vS. betulifolia, and also from Siberian specimens of the same in the 

 Torrey Herbarium. After some search among the literature on 

 the genus, I found that the Alaskan plant had been described by 

 C. K. Schneider. That S. Steveni is distinct from S. betalifolia, is 

 evident. There may be some doubt, however, whether it is spe- 

 cifically distinct from 5. Beauverdiana of which Schneider made it 

 a variety. I have seen no specimens of S. Beauverdiana, but 

 from the characters given by Schneider, it seems distinct enough. 

 It is strange that the oldest specific name and publication of 

 the beautiful little shrub of the mountains of California and Ore- 

 gon, usually known as 5. arbuscula, should have been overlooked 

 so generally. Only in a single one of the later German works on 



mann was amply published. 



Tft/i 



Hi 



California: Summit, Central Pacific Railroad, July, 187; 

 H. Edwards. 



ha 



J*P 



I 



ve seen the following specimens : 



Pennsylvania: Point Pleasant, July II, 1898, C. D. Frets ; 

 Liberty, September 1, 1906,/ K. Small. 



■ S. salicifolia is not found native on this continent. What has 

 gone under that name, is partly S. latifolia, and partly 5. alba. 

 The former is distinguished by its broad, obovate or oblanceolate 

 le aves and almost glabrous inflorescence. When the flowers first 

 °Pen, they are usually more or less pinkish ; but in age they be- 

 come white. Even in " Gray's New Manual," S. alba is described 

 as & salicifolia. The two resemble each other in the narrower 

 le aves and the pubescent inflorescence, but differ in the flowers, 

 wh 'ch in S. alba are white instead of deep pink, and in the leaves, 

 ' *hich are broader above instead of below or at the middle. 



In Canada and northern New England and New York there 



