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1896 | ROSAE AMERICANZE I 
slender and never take the form, at least on the stems and prin- 
cipal branches, of the stout prickles of R. Nutkana. Inthe latter, 
the paired prickles are more or less curved or hooked, and only 
exceptionally on the slender axes do they become more or less 
straight. I shall consider later other characters which separate 
R. pisocarpa and R. Californica from R. Nutkana. 
Let us examine at present the geographical distinction of 
the latter. In his monograph, Watson says that it occurs along 
the Pacific coast from Alaska, in 62° lat., to Oregon, and extends 
eastward into the mountains of Idaho and northern Utah, where 
the Wahsatch marks its limit. Including the variety Azspida, its 
eastern limit is extended into western Montana. From material 
which I have received, I have recognized the species beyond the 
limits of the United States in Vancouver island, in the lower 
valley of the Fraser, along the upper Columbia, also in Alberta. 
I have received specimens from the island of Sitka, which appear 
to me to belong to R. Nutkana. The material from the island 
Kodiak, which I have described under the name of &. Aleutensis, 
perhaps is, as Watson thought, a variety of the type of Presl, 
but before accepting this identification fresh investigation must 
be made. 
Upon this side of the frontiers of the Dominion the species 
occurs in Washington and Oregon between the Pacific coast and 
the Rocky mountains. Does it reach California or Nevada? It 
occurs in the Siskiyou mountains, at the boundary of Oregon and 
California. Towards the east it extends to the mountains of 
Idaho and Montana. It is not very rare in Utah in the Great 
Salt Lake region, from which I have received specimens collected 
by Jones. In these localities it occurs at an altitude of 8,000 
feet. Mr. Porter has sent me two floriferous branches collected by 
Mr. John Scott, in 186g, in the mountains of Colorado. These 
branches, reported as R. Woodsii, seem to me to belong to &. 
Nutkana. It is altogether likely that the species will be discov- 
ered in the mountains of Wyoming. According to the known 
facts, therefore, R. Nutkana has a boreo-occidental distribu- 
ution. 
