82 RYDBERG: NOTES ON ROSACEAE 
LOWER CALIFORNIA: Todo Santos Bay, Parry, Pringle, Orcutt; 
Ensenada, M. E. Jones 3697, Anthony 189; San Quentin Bay, 
Palmer 619. 
IV. GYMNOCARPAE. This is a litt!e group of species all 
confined to the North American Pacific coast. 
31. RosA GyMNOCARPA Nutt.; Torrey & Gray, Fl. N. Am. 1: 
461. 1840 
Until recently only one species, Rosa gymnocarpa Nutt., and 
one variety, var. pubescens 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. abietorum, R. amplifolia, R. leucopsis, R. Helleri, R. apicu- 
lata, and R. dasypoda. Of these the only clearly distinct spe- 
cies is R. crenulata, which, however, has an older name, R. 
Bridgesii Crépin. 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 
* Leaflets 2: 254-261. IgI2. 
