250 THE JOURNAL OF BOTANY 
observable and should be noticed as subsidiary characters of some 
i 
Subfoliar glands are organs of considerable importance, whole 
si bh 
they are less usually coloured, but may be oie as me 
. Borrert group, or in many of the subsection Villose, or small 
and inconspicuous, as in others of the Villose, or some of the 
R. coriifola group. Going further still, the glands may become 
almost invisible except through a strong lens, such occurring in 
the last-mentioned group, also sometimes in the Dumales. It 
e 
lopment at which these very small glands, which “a have called 
“ microglands,”’ should be reckoned as glands, but for the present 
we suggest that only those glands which are either visible to the 
jee eye, or are readily seen with a low-power lens, should be so 
rec 
The position of the glands is also of the greatest importance. 
They may occur only on the midribs, in which se though not 
negligible, they are not of importance, but when they occur on 
) 
the veinlets, so as to be apparently spread over the 
whole under surface. There is o often a tendency for the subfoliar 
glands to be collected near the margins of the leaflets, especially 
on the flowering-shoots, and in doubtful cases these should always 
be examine 
We may therefore classify subfoliar glands as follows :— 
(1) Sessile, small, and inconspi-\ /(a) On midribs only. 
cuous (microglands). 
(2) Sessile or subsessile, aut (6) On midribs and secondary 
veins. 
larger mie someti 
dark-colou 
(3) tee ene and || (c) On all re smaller veins, at 
ually dark-coloured. least towards margins. 
Peti di — These have eeietnioa only in respect “e their 
dlotiing, and then only with rather wide variation. In compara- 
tively few species are the petioles quite free from thie and in 
still fewer from glands. Even in R. lutetiana Lém. a few glands 
are frequently seen on the petioles, though they are normally 
quite eglandular, as is also the case with some species of the 
groups f. dwmetorum and R. glauca. Almost all others have 
are Seoul glabrous ; es in those groups which have ha 
leaflets, the petioles are always hairy. The hairs may be loose 
