170 RYDBERG: NoTEs ON ROSACEAE 
to the ashy gray bark and the petioluled leaflets, characters 
which I think are not distinctive. In the typical R. gymnocarpa 
the bark is often light in color on old stems, and many specimens 
from the range of the typical R. gymnocarpa have more or less 
petioluled leaflets, such as Jones 1088 and R. S. Williams 876 from 
Montana, Sheldon 8521 from Oregon, and Allen 72 from Washing- 
ton. I therefore regard this as a synonym of R. gymnocarpa. 
Rosa abietorum Greene, I take as an unusually bristly R. 
gymnocarpa. I have been unable to find any constant character. 
Rosa amplifolia Greene. I have not been able to distinguish 
this from R. gymnocarpa. Dr. Greene’s remarks, ‘‘the leaves 
are so very large and have so much the color, texture and pattern 
of R. acicularis, that but for the small solitary flowers this would 
have passed readily with many for that species,” are at least con- 
fusing. R. acicularis has rather thick, elliptic leaflets, decidedly 
pubescent beneath. Dr. Greene must have had an erroneous 
idea of R. acicularis. 
35. RosA LEuUCOPsis Greene 
This is so close to R. gymnocarpa that I hesitated to admit it 
as a species. In R. gymnocarpa and R. prionota the leaflets are 
very thin and reticulate with semi-pellucid veins. In R. leucopsis 
the leaves are not so thin and the veins are faint and not at all 
pellucid. Otherwise the three plants are very similar. The 
species was described from fruiting material; the plant becomes 
paler in age. ; 
Rosa Helleri Greene is evidently the same plant in flowers and 
shows only slight variation from the type of R. leucopsis, The 
Idaho specimens are mostly like those of the type of R. Helleri, 
but two numbers of Sandberg, MacDougal & Heller are almost 
identical with the type of R. leucopsis. 
36. Rosa PRIONOTA Greene 
This has been discussed before (see Bull. Torrey Club 44: 
32. 1917). , 
Rosa piscatoria Greene I regard as an ey strong and 
bristly plant of R. prionota. 
Rosa apiculata Greene was so named on account of the form 
