152 Rydberg: Notes on Rosaceae 



the leaves are still thinner and glabrous or nearly so. Slender 

 forms, in which the branches are arching, resemble also some- 

 what R. lucidus, but the leaves are not persistent, not so shining 

 and much thinner. The following specimens belong here. 



Alabama: Auburn, 1898, Baker 1590; Spring Hill, 1909, 

 Mackenzie 4018; Mobile, 1899, Earle 2014. 



North Carolina: Lake Catherine, House 4517. 



Illinois: National Stock Yard (opposite St. Louis), 1878, 

 Eggert. 



Ruhus frondosus Bigelow has been misunderstood and not well 

 known, probably because there were so few specimens in the 

 herbaria. Mr. Blanchard had done a good deal in clearing up the 

 confusion. R. frondosus is not so rare, however, as supposed, and 

 has a rather wide range, extending as far west as Kansas and Iowa. 

 The range north and south, however, is not so wide, only from 

 Massachusetts to Virginia. It is evidently confined to the hard- 

 wood belt. R. philadelphicus is but a small-leaved form of the 

 same. 



Ruhus recurvans Blanch. I cannot distinguish R. arundelanus 

 Blanch, and R. Jeckylanus from the same. R. recurvans itself is 

 not a very strong species, being closely related to R. frondosus. 

 Mr. Bicknell does not regard it as distinct. R. recurvans has a 

 more northern distribution, but the two come together in south- 

 ern New England and New York. 



Ruhus Brainerdi Rydb. This plant Professor Brainerd had 

 in mind when he raised R. nigrobacctts sativus Bailey to specific 

 rank. It has nothing to do with R. nigrohaccus sativus, however. 

 Its relationship is with R. frondosus on one hand and R. Baileyanus 

 on the other. It cannot very well be a hybrid of the two, for the 

 type station is practically outside the range of both species. 

 Professor Brainerd regards it as a form of R. recurvans. The 

 following specimens have been collected. 



Vermont: Otter Creek, Wrybridge, 1899, Brainerd; Twin 

 Mountain, West Rutland, 1900, Eggleston 2005; 1899, Eggleston 

 1209, 2661; Weybridge, 1902, Eggleston 2893. 



Ruhus pergratus Blanch. This seemed to me for a long time as 

 the hybrid of R. canadensis and R. nigrohaccus and it resembles in 

 many points that hybrid, but both Mr. Blanchard and Professor 



