[ 





CERTAIN WESTERN ROSES. 255 



number of gymnocarpous kinds which, obviously distinct, 

 have found place in the herbaria under the name /^. gywno- 

 carpa, yet only so because of hasty and superficial glances at 

 the fruits alone. 



w 



In proposing the following segregates, I have left untouched 

 all the Columbia River region material. This is NuttalFs 

 original locality ; and all that is in those seaward parts of 

 Oregon and Washington may or may not be referable to true 

 R' gyntnocarpa ; but all the new segregates are from parts of 

 eastern and arid regions where Nuttall never traveled, at least 



Washingt 



segregates 



another way, as completely isolated not only from the true 

 Oregonian type but from each other ; and they will be found 

 invested with diagnostic characters more pronounced than 

 most of the published species of Rosa have to show. 



Rosa glaucodermis. Bark of old branches ashy gray, of 

 the younger and growing ones green and glaucous, rather well 

 armed with prickles not stout, and all ascending rather than 

 spreading : leaves rather large for the group, and lax, leaflets 

 very distinctly petiolulate, usually 7, rarely 9, oval to obovate, 

 with a shortly cuneate tapering to the base, sharply and doubly 

 serrate, deep-green above, pale beneath, neither face either 

 notably venulose or at all reticulate, glabrous ; rachis slender, 

 with very few prickles, the glandular hairs also very sparse 

 and short ; stipules broad throughout except as to the rather 

 narrow and very acute lobes : fruit acutish at both ends. 



Shasta Springs, Shasta Co., Calif., collected in 1894, by 

 W. L. Jepson, communicated to U. S. Herb., there occupying 

 sheet 480045. One of the characteristically Californian group 

 with green and glaucous branches instead of the glabrous red 

 ones of R, gymnocarpa; this the only species yet seen with 

 distinctly petiolulate leaflets. 



Rosa crenulata. Bark of old branches red-brown, of the 

 younger pale-green, the prickles very few and firm ; leaves of 



