HETEROPYXIS. | 527 
. Bombace are said to have a calyx with a ruptile de- 
hiscence. 
The first statement is an obvious error, the second will 
exclude Durio from the family. 
There is however an objection presented by the venation 
of the filament which may be of some weight. I allude 
. toits having only a single vascular fascicle when present- 
ing no traces of composition, such as furrow, or division. 
This having two fascicles, when it does present such, I con- 
_ Sider it to intimate that the union has been secondary, each 
- fascicle representing that of one phalanx. 
The fact of the coalition of the stamens taking place at all, 
ud leads me to doubt whether, whenever there is more than one 
. Pyxide, the anther is not composite. For the radiation of 
the vessel towards the pyxid is contrary to the usual ve- 
nation of anthers, and it would be consonant with the struc- 
ture of the family both as regards unilocularity of the an- 
s ther, and composition of certain of these. 
— There is nothing it appears to me in the petals, when 
More than one in number, beyond the deminished size of 
the lateral ones, to indicate, that the plurality arises from 
 Xcessive and complete division of one lamina, but even. 
“us structure may be considered reducible to that of the 
family, the petals of which have many basilar veins, or se- 
Veral primary vascular fascicles. 
The composition of the interior stamina is further pointed 
by the corresponding increase in size, as we proceed 
vards the centre. 
From some appearances of part of the pollen when the 
Case is freed entirely from its contents, it is not improbable 
that its development is gradual, as has been observed by 
Brown in certain Aroidez, with not I believe, a very dis- 
ilar dehiscence of the anthers. 
It is to be remembered too, that the radiation of the vessels 
he connective is scarcely discernible in old specimens, at 
I find it in macerated specimens. 
