Transactions. 107 



very extensive and carefully liotanisecl area. It is perhaps too 

 soon to speak definitely of the distribution of the roses in our 

 district, but apparently the greater number are met with in the 

 main valley of the Nith, and often many varieties I have observed 

 grow together in a small area. They appear to thin out some- 

 what in the side valleys, and the fewer number reach the base of 

 our higher hills. Although from this height some are found with 

 Rosa mollis, notably subcristata and dumalis descending through- 

 out the range to sea level. The study of roses is rendered more 

 difficult and confusing fiora the occurrence of approximate and 

 intermediate forms. I have to acknowledge invaluable help from 

 Mr Bennett of Croydon, in naming specimens and for his kind- 

 ness in sending a collection to Mr Baker, of Kew, for inspection. 

 I append a full list of the yenus as found in Nithsdale by Dr 

 Davidson and myself, whicii will bring it up to date and facilitate 

 further search. In it are included a few intermediate forms 

 which may be found interesting, having had the best authority 

 for their recognition. 



LIST OF ROSiE. 



1. Rosa spinosissima, Linn. 



