GENERAL REMARKS. 211 
The leaves are well developed but deficient in stomata the 
place of which is supplied by jointed lax hairs, with which 
both sides are covered, those of the under side being most 
developed but perhaps less frequent, the vernation is plicately 
conduplicate. Instead of being evascular, it is highly vascular, 
especially the axis. 
Altogether I know of no peculiarity in its structure ex- 
cept the want of stomata, which is remarkable considering 
that the leaves are aéreal and the green matter well deve- 
loped. 
The venation is reticulate as іп many Aroideæ, and the 
vessels are disposed in 3 or 4 layers, the primary fascicles at 
some distance from each other, and placed on the same line, 
see section of Carine. 
Pistia stratiotes CCLX. Fig. I. 
a. Spatba just opening, laterally viewed, 
b. Do., in front. a stigma, female fissure opens first. 
c. Do., long section. a pistillum, 4 intermediate gland, c 
cyathiform gland of male, d column of male flowers. 
d. Male flower in a young state. 
d a, an anther from ditto. 
e. Male flower of c е a, same viewed laterally; e 5, 
another of до. ; e c, transverse section of do. 
f. Anthers, after dehiscence. 
g. Pollen. 
h. Portion of placenta and ovule of young ovary; a testa, 
b tegmen; b a, line indicating its composition. с 
nucleus ; d opaque aereferous tissue of base of ovulum ; 
e vascular supply: p a, tegmen and nucleus of se- 
cond ovule. 
Pistia stratiotes continued CCLXI. 
A. Long section of spadix and spathe, after dehiscence of 
the anthers. 
