74 DEVELOPMENT OF THE FLOWER. 
the irregularity of its form; this is quite independent in 
some cases of the style itself as in Acalypha, where the 
style is confined to the back, is green and undivided, 
while the stigmatic tissue is prolonged into sepal.like seg- 
ments. 
Pl. 40. Fig. 3.—b. style which is of green colour, a, a, a, 
stigmatie surface formed into segmenta, c, c, c, c, generally 
3-4—2 in front.] 
In Trichodesma, the stigma is papillose, arising both 
from the margin of the united styles, as well as from a very 
distinct cord of dense fibrous tissue, which occupies the whole 
of the canal ; and which on reaching the base of the style, 
spreads out a lax lining of the branching cyclotic tissue, - 
which establishes a direct communication with the placenta 
of each ovulum. The transition from the elongated dense 
cells of the conducting tissue, to the short, lax, oblong pa- 
pille of the stigma itself, is very abrupt. 
The style has two vessels, as usual. The raphe is next 
the axis; the part of the ovarium corresponding to the cells, 
is of different texture from the rest; the cells look as if im- 
bedded in torine tissue, but this is as continuous with the 
. style as the other; and besides, the young ovary is uniform, 
and the situation of the vessel between the cells shews that 
the torine tissue is ovarial. 
Therefore “there is occasionally a difference in tissue 
between the part of the lamina of a carpellary leaf, as in Tri- 
chodesma, in which the tissue of. the cell is very different 
from that of the rest, to which the induration that sub- 
sequently takes place, is confined. 
In Echinops the stigmatic surfaces are as in Aplotaxis. 
There is this difference, however, between the dorsal of 
the separated part of the style, that the hairy portion is 
confined in Echinops to the upper half, originating as in 
Aplotaxis from a sort of annulus of larger and denser hairs. 
In this plant also, although there is as usual only 2 vascular 
bundles towards the base of the style, yet from the subdivi- 
sion of these above the stigmatic part of the styles may have 
as many as 3 branches. This is the only instance of the | 
