108 THE SUBSECTION EU-CANINEZ OF THE GENUS ROSA 
retained the names under which each species or variety has been 
described, omitting synonymy, on account of the great difficulty 
of verifying it. The descriptions are in many cases obviously 
complicated a genus. I have given them because in a good 
irect to i 
characters, and not until we have studied the group for some 
years, with Continental assistance, can we hope to master the 
subsection. 
