[From the Bulletin or the Torfey Botanical Club, a«: i-:--*:* 5 Aogast 1921] 



Notes on Rosaceae — XIII utitH 



Per Axel Rydberg 



Roses of the Columbia region 



In this region I here include the states of Oregon and Washing- 

 ton, together with British Columbia and northern Idaho. M 

 important are the roses of the Cascade Mountains. * In the north- 

 ern part many of the species of the Rocky Mountains have in- 

 vaded the region, not only on the western slopes of the Rockies 

 but also in the Cascades: in the Siskiyou Mountains of southwest- 

 ern Oregon there are also found some Californian species: and in 

 eastern Oregon some of those belonging to the Great Basin are 

 found. Since my revision in the Xorth American Flora we have 

 received in exchange a collection from British Columbia, from 

 the Geological Survey of Canada; and Professor J. K. Henry of 

 the University- at Vancouver has sent in another collection for 

 determination. Also. I have seen collections from southeastern 

 Oregon made by Miss Eastwood and Dr. Rehder for the Arnold 

 Arboretum. 



Key to the groups of species 



a much exserted. about equaling the ,ies 



adnate; sepals reflexed. deciduous: 

 climbing, with curved pri . L Si 



? not exserted. or only slightly so: stigmas forming a head 



closing the mouth of the hypanthium. 

 Pistils numero _ he upper part 



hypanthium persistent. 



he Bulletin 48: 141-15$. pL 3 _ 



159 



