4 THE SUBSECTION EU-CANINEZ OF THE GENUS ROSA 
their hairiness and the glandular development on their backs is 
less variable, and usually affords assistance in the determination of 
he species. i. glauca and most of its varieties may usually be 
recognized by the broadness of their stipules and their spatulate 
auricles 
The petioles may be glabrous or hairy, glandular or not, 
ickly or unarmed, but these characters must not be relied 
ary me 
from those of BR. lutetiana, yet many of the latter group have 
ger ie as glandular as many of those associated with 
umalis. 
m t oe lly 
we come to the strongly biserrate varieties of R. dumalis, the best 
developed of which have two or three denticles on each side of the 
primary teeth 
Again, though all the species allied to R. canina are said to 
have glabrous leaflets, rarely a slightly hairy midrib is found, while 
O: y e 
(?. e, other than on the midrib and secondary nerves) in any of the 
species of the subsection Eu-canine, but they may certainly be 
