Conopholis americana. 15 
Cross sections of the stalk, which happen to be under or at 
the base of the leaf (Plate V, Fig. 3), show invariably a 
migration of bundles from the inner toward the outer row, 
and from the outer toward the leaf. This would seem to 
indicate that both rows of bundles consist of leaf traces, but 
for reasons which will be given later, it is certain that this is 
only directly true of the outer row, which may be considered, 
then, to be both cauline and leaf trace, whereas the inner 
row is cauline. 
The epidermal cells of the flower stalk are somewhat irregu- 
larly thickened, and contain stomata. Strange to say, there are 
no stomata on either surface of the leaves, another indication 
of the greater depth of parasitism to which this particular 
member of the Orobanchee has descended. 
The Orobanche@ in general have more numerous stomata 
than most parasitic plants (Unger, Exantheme d. Pfl.), but 
Conopholis is not the only member in which they are curiously 
placed. Lathrea Squamaria has them on the pistil only 
(Krause), while in the closely allied species, Z. clandestina, 
they are in normal numbers and on the leaves (Duchartre). 
IMMATURE FLOWERING STALKS. 
Plate IV, Figs. 1, 2, 3 and 4, are photomicrographs of ver- 
tical sections through young buds of flowering shoots. It will 
be observed that in Figs. 1, 2 and 4 are plainly seen the outer 
and an inner row of fibro-vascular bundles already described 
in the adult shoot. These anastomose with each other and in 
no case “end blindly beneath the apex of the stem”’ as they 
are said to do in other genera of Orobanchee (de Bary). 
Figure 3 is taken from a section cut at such an angle that 
the anastomosis of the numerous bundles of both the inner 
and outer circle is demonstrated. 
” 
In Fig. 2 it will be seen that the outer circle consists of 
leaf-trace bundles, and also that the inner circle anastomoses 
with it at intervals below, as well as at the apex. This as 
