Rydberg: Notes on Rosaceae — XIV 71 



Flora of Colorado. Later I have had access to Prince Maxi- 

 milian's Reise and found that the plant described there was the 

 glabrous plant or the true R. Woodsii. In my Flora of Colorado 

 I made another mistake, adopting the name R. Macounii 

 for the glabrous plant, depending upon the impression I had 

 received from Greene's rather vague description. After having 

 seen Greene 's type, though this does not represent the common 

 form of the species as I know it, I came to the conclusion that 

 the name R. Macounii should be adopted for the species here 

 treated, being the oldest available name. R. grosseserrata E. 

 Nelson was a mixture, but the type evidently belongs to the 

 large-leaved form of this species not uncommon in the Central 

 Rockies. R. subunda Lunell represents a depauperate form and 

 R. naiadum the more common form of the plains and prairie 

 region. 



Minnesota: Montevideo, Moyer 372. 



North Dakota: Kuhn, La Mouse County, Brenckle; 

 Minot, Lake Ibsen, Jamestown, Tower, and Butte, Lunell 

 (without numbers). 



South Dakota: Hermosa and Hotsprings (Black Hills), 

 Rydberg 677; Wolf Creek, Visher 2i8q; Bear Creek, Visher 

 2032; Mobridge, Moyer 691, Big Stone Lake, 542 



Nebraska: Chadron, /. M. Bates; Lawrence Fork, Rydberg 

 102; Banner County, Rydberg 98; Hay Springs, MacDougal 102; 

 Nattick, Thomas County, Rydberg 1848. 



25. Rosa pyrifera Rydberg 

 This is a species of the Northern Rocky Mountains, first 

 mentioned by Watson in a note under R. Fendleri* It differs in 

 the pear-shaped fruit and the more numerous, rather corymbose 

 flowers. A few rather dubious specimens have been collected in 

 the plains and prairie region. These have fruits which are 

 inclined to be ellipsoid, rather than pyriform. Among them 

 may be noticed. 



South Dakota: Mobridge, Moyer 688. 

 *Proc. Am. Acad. 20: 345. 1885. 



