Vol. 48 No. 6 
BULLETIN 
OF THE 
TORREY BOTANICAL CLUB 
JUNE, 1921 
Notes on Rosaceae—XIII 
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. Most 
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 North 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 
Styles much exserted, about equaling the stamens; stipules 
adnate; sepals reflexed, deciduous: styles united; stem 
climbing, with curved prickles. I, SYNSTYLAE. 
£ :. i= 
Styles not exserted, or only slight! & 
closing the mouth of the S csasicliun: 
Pistils numerous; styles as well as the upper part of the 
hypanthium persistent. 
{The Balletin for May (48: 141-158. pl. 3) was issued May 25, 192t1.] 
159 
