82 Rydberg: Notes on Rosaceae 



Lower California : Todo Santos Bay, Parry, Pringle, Orciitt; 

 Ensenada, M. E. Jones jdgy, Anthony i8g; San Quentin Bay, 

 Palmer 6ig. 



IV. GYMNOCARPAE. This is a little group of species all 

 confined to the North American Pacific coast. 



31. Rosa gymnocarpa Nutt.; Torrey & Gray, Fl. N. Am. i: 



461. 1840 



Until recently only one species, Rosa gymnocarpa Nutt., and 

 one variety, var. pnbescens S. Wats., have been admitted to this 

 group. R. gymnocarpa ranges from British Columbia to Montana, 

 Idaho and California. Dr. Greene in one paper* described not 

 less than twelve species which he regarded as belonging to this 

 group and seven more related to it but "not at all gymnocarpous." 

 It is impossible for me to follow him in his segregation of Rosa 

 gymnocarpa, and several of his "gymnocarpous" species do not 

 belong to the group at all. 



The Greenian species really belonging to the Gymnocarpae are 

 the following: R. glaucidermis, R. crenulata, R. prionata, R. pisca- 

 toria, R. ahietorum, R. amplifolia, R. leucopsis, R. Helleri, R. apicu- 

 latu, and R. dasypoda. Of these the only clearly distinct spe- 

 cies is i?. creimlata, which, however, has an older name, R. 

 Bridgesii Crepin. Of the others I have retained as tentative species 

 R. prionata, R. leucopsis and R. dasypoda, but none of these are 

 too good as species. They are fairly good varieties, but the rest 

 are hardly worth naming even as forms. As most of them belong 

 to the Columbia Valley region, I shall discuss them further in a 

 subsequent paper and only mention those found in California. 



32. Rosa prionota Greene, Leaflets 2: 256. 1912 



The species is distinguished from R. gymnocarpa by the 

 small and often more numerous (seven to nine instead of five 

 to seven) leaflets with narrower and sharper teeth. The terminal 

 leaflet is usually cuneate at the base instead of rounded. The 

 fruit is described as globose. Both in this species and in R. 



gymnocarpa the immature hypanthium is ellipsoid. If only one 



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* Leaflets 2: 254-261. 1912. 



