Vol. 44 No. 2 
BULLETIN 
OF THE 
TORREY BOTANICAL CLUB 
er ne ee ne 
FEBRUARY, 1917. 
Notes on Rosaceae—xX|I 
Per AXEL RYDBERG 
ROsES OF CALIFORNIA AND NEVADA 
Two years ago I had practically completed the manuscript for 
the monograph of the genus Rosa to be printed in the North Amer- 
ican Flora. As this would only make half a part as usually pub- 
lished, and as the rest of the manuscript for the same part, which is 
to be contributed by other persons, is not yet ready and may not be 
for some time, I thought it would be advisable to publish some of 
the notes and some of the descriptions of new species in advance. 
Besides, Professor Le Roy Abrams, of the Leland Stanford Uni- 
versity, has sent me for determination the collection of North 
American roses, found in the herbarium of the said institution. 
I therefore think it is a proper time to put on record my present 
knowledge of the genus Rosa, with particular reference to California. 
and Nevada, the two states best represented in that collection. 
Key to the groups and species 
Pistil tyl well as the upper part of the hypan- 
thium persistent. 
Flowers corymbose or, when solitary, supported by bracts; 
achenes borne both on the inner walls and in the 
Stem with scattered prickles, rarely also with inter- 
mixed bristles; sepals distinctly lobed; foliage glan- 
dular-punctate, sweet-scented. 
Stem, at least the young shoots, bristly; prickles infra- 
stipular or lacking; sepals entire or only the outer 
[The BULLETIN for January (44: 1-64) was issued February 12, 1017. ree 
65 
I. CANINAE. 
