94 DEVELOPMENT OF THE FLOWER. 
Cheiranthus.—In this the number of vessels is the same 
as in Alyssum, but in an early stage at least the dorsal vessel 
is most developed, or nearly as much as in Alyssum, the 
lamina becomes afterwards very veiny. The septum is in 
the direction of the axis, consequently the carpellary leaves 
are right and left. 
It is obvious enough with regard to Crucifere, that the 
apparent opposition of the: stigmata to the placenta may 
arise from cohesion between the stigmatic surfaces, of such 
a nature that the usual sinus of distinction be quite oblite- 
rated. "These plants furnish the only instance I know of. in 
which the placentary vessels are the largest, and send up the 
chief supplies for the style. The subject is obscured by the 
nature of the placental vessels ; it is obvious that if the pla- 
cental margins of a leaf furnished with a midrib be vascular, 
at least 3 vascular cords must exist in the carpellary leaf ; 
now in these I only find two, and these are not disposed to 
separate. - 
The glands opposed to the shorter stamina are inside; 
while those which are sub-opposed to the longer, are outside, 
hence there are 3 series of stamina; it is most curious that 
the innermost should be the most developed. 
If the placentz of these plants be marginal, as I can 
scarcely doubt, the carpellary leaves have a right and left 
position. 
In Thunbergia, including Meyenia, etc. we have every 
variety of cohesion. In T. alata the dilated parts of the 
style are equal, and the stigmatic surface is confined, as in 
all the others to the upper margin ! 
In Meyenia Hawtayneana, the lobes are rather unequal, 
each lobe is bilobed divaricately, and a good sized sinus 
exists in the upper; opposite the end of the style which is - 
marked by a mucro, it is singular that the stigmatic surface 
of the upper lip is confined to the margin of each lobe, 
while that of the lower occupies all the margin, except the | 
outer. . [This I doubt.] 
In the yellow Thunbergia, the stigmatic suele are dis- 
tant; the upper division of the style is -sub-involute, the 
