POC ee ae ee ee en 
1896 | ROSAE AMERICANA 31 
by an articulation towards the summit, permitting the calyx to 
detach itself in one piece, leaving the receptacular cavity open. 
This singular articulation, which is constant, also occurs in two 
Asiatic species of the same section of CinnAMOME, R. Beggeri- 
ana Schrenk and R. Alberti Regel. 
Watson includes in the geographical range of R. gymnocarpa 
British Columbia, Washington and Oregon, and all of California 
to the latitude of Monterey. He expresses doubt as to the exist- 
ence of the species as far south as San Diego. Lastly, he also 
includes in the range northern Idaho and northwestern Montana. 
With the exception of Montana I have received numerous speci- 
mens representing the different regions cited by Watson. The 
northernmost station from which I have received specimens is 
situated in 55° lat. These were obtained by Mr. Meehan, I 
should add, in passing, that I can confirm the exactness of the 
mention by Mr. Holzinger (doc. cit.) concerning northern Idaho. 
According to the facts thus far recorded the distribution of R. 
s&ymnocarpa appears to be occidental, and does not extend very 
much towards the east. 
As can be seen from the above remarks, there remain many 
researches to be made and points to be established before arriv- 
ing at a complete acquaintance with the genus Rosa of western 
North America. When it is known how much research the 
roses of the Alps have demanded, it should be expected that the 
immense extent of the Sierras and Rocky mountains would in 
their turn demand an equal amount of investigation. 
It is reasonable to suppose that these American regions have 
not yet disclosed all their rhodological riches ; and that there 
will be discovered there unpublished types. Perhaps many 
such are already in herbaria, but confused as varieties of species 
already known. 
Among the readers of the above paper who desire to coop- 
erate in the work to which I urge American botanists perhaps 
there may be found those who shrink from the task of extracting 
from my notes anything essential or practical for the distinction 
