168 Rydberg: Notes on Rosaceae 



Columbia region, especially west of the Cascades and the latter 

 in the northern part of the Great Basin, which includes eastern 

 Oregon, both extend north into British Columbia. 



28. Rosa Covillei Greene 



This species and R. Bolanderi are characterized among the 

 cinnamon roses by the short ovate, short-acuminate sepals. 

 R. Covillei is known only from the type locality, near Naylor, 

 Klamath County, Oregon. 



29. Rosa spithamaea S. Wats. 



This species of northern California has been collected at one 

 locality in the Columbia region : — 

 Oregon: Wimmer, Hammond 120. 



30. Rosa adenocarpa Greene 



Notwithstanding Dr. Greene's remark, "despite all its peculiar 

 characteristics, a genuine member of this gymnocarpa group," 

 I am compelled to exclude it. The upper part of the hypanthium 

 and calyx show no sign of being deciduous, the sepals are not 

 those short ones of the R. gymnocarpa allies, and the hypanthium 

 is bristly. These characters and the dwarf herbaceous stems indi- 

 cate that the plant is related to R. spithamaea, where I have 

 placed it. It is known only from the type locality, Mt. Gray- 

 back, southwestern Oregon. 



31. Rosa pyrifera Rydberg 



This species is related on one hand to R. Macounii and on the 

 other to R. ultramontana and R. pisicarpa, but differs from them 

 all in the pear-shaped hypanthium, which has a more distinct 

 neck. It is common in the northern Rockies, but the following 

 specimens are from the Columbia region : — 



Washington : Clarks Spring, Kraeger 47. 



Oregon: Powder River Mountains, 1896, Piper; Horse 

 Creek Canyon, Sheldon 8138; Thompson Creek, Brown 86; 

 Ashland, Walpole 375; Tygh Valley, Walpole 336; Cow Creek, 

 Coville 1162; Blue Mountains, Cusick 16Q7. 



