ROSE TRIBE. 



201 



ROSA CANINA (Dog Rose). 



5. R. arvensis (Trailing Dog Rose). Prickles on the 

 young shoots feeble ; leaves 'smooth ; calyx slightly 

 pinnate, not remaining attached to the fruit ; styles 

 united ; stigmas forming a round head. Woods and 

 hedges ; common in the south of England. Distin- 

 guished from all the other British species of Eose by 

 its slender, trailing stems. The flowers are white and 

 scentless, and there are fewer prickles than in most 

 other species. Fl. June August. Shrub. 



* Botanists describe no less than nineteen species of 

 native Eoses, but, as many of these are rare, and the 

 characters of others are difficult to discriminate, it has 



