invalidated when we consider the fact that the corres- 
ponding trace in orchids like Cypripedium and Paphioped- 
lum, which possess labella of much larger size and display 
than those of Cymbidium or Hulophia, is always single. 
ee 
Be i 
yz ~ 
B A 
5 
BDS 
— 
(¢ 
Fig. 3. A. Transverse section of an ovary showing the disposition of 
the six main vascular traces running in its wall, B. A portion of a 
transverse section of an ovary enlarged; traces DS and one of its 
adjacent LP are shown. 
Another point which may be noted here is that the 
traces running along the placentae and underlying the 
inner whorl of perianth members do not show any signs 
of breaking up and supplying any part of the placentae. 
Hence the ovules are totally devoid of any kind of vas- 
cular supply. 
Types of Vasculature in the Flower 
The six main traces of the ovary begin to break up 
further into the various traces of the floral whorls and 
organs just below the level of insertion of the perianth. 
Though the general scheme of splitting is essentially the 
same in all the orchids investigated, three distinct types 
[ 69 | 
