BOTANICAL INFORMATION. 243 
pensis does from L. Cliffortiana, by the ovary scarcely adhe- 
rent, though not wholly free. 
The two last orders in the volume, Convolvulacee and Bo- 
raginee, belong, as to placentation, to the same group as 
Labiate, and perhaps some other orders not vet published, 
having a bicarpellary (rarely tricarpellary) ovarium, with two 
collateral ovules in each carpel; the ovary being sometimes 
unilocular, but more frequently divided by more or less com- 
plete dissepiments, either between the carpels only, or trans- 
versely also between the ovules. The dissepiments, when 
they exist, are generally, if not always, free from the ovules 
which have an independent insertion ; thüs affording a strong 
argument to those who advocate the attachment of ovules to 
à prolongation of the axis, and not to the margins of the car- 
pellary leaves. Li | 
at Geneva, liad the full command of De Candolle's materials, 
including several sets of Convolvulacee communicated ex- 
pressly for his use; he was known to have applied himself 
for many years with great zeal to their study, and we had 
confidently expected to have seen the confusion which has 
Prevailed over the extensive genera of that order, in a great 
measure dissipated ; but we have been disappointed. "There 
are great difficulties, it is true, arising from the number of 
stmilar-looking but very distinct species, as well as of dissi- 
milar forms assumed by one and the same species, from the 
Véry incomplete specimens usually sent home by collectors, 
and from the unusually large number of species imperfectly 
9r incorrectly described ; yet, if we are authorized in assert- 
ing that many of the genera as here circumscribed are not 
natural, that they contain species which do not agree with 
the artificial character given, that some of the more important 
characters are incorrectly expressed, that the principles 
adopted are often unphilosophical, we may well add that the 
monograph of Convolvulacee remains to be done. We would 
er express a hope, that when that is at length accom- 
: pim T9 
