BOTANICAL INFORMATION. 245 
bus 2. Stylus divisus aut styli plures." In the first subtribe, 
however, we have several Porane, with a style confessedly 
semi-bifid, and some Convolvuli in which it is really so, whilst 
in the second, there is also Breweria, where the style is 
described as “1, semi-bifidus;" and the two subtribes thus 
characterized, are therefore not distinct. The fact is, suffi- 
cient attention has not been paid to what portion of the style 
is or is not stigmatic. The bifurcation of the style is more 
or less apparent in the great mass of Convolvulacee (as well 
as of a great many other bicarpellary orders); in numerous 
cases it is only so at the summit, and the very short branches 
are entirely covered with the stigmatic papille. In these in- 
stances the branches of the style and the stigmata are synony- 
mous terms; in most Convolvuli, however (as well as in 
several Jacquemontiæ, and perhaps a few Ipomee), the papillæ 
cease at some distance (however small) from the bifurcation, 
When it manifestly becomes incorrect to designate the style 
as simple with two stigmata ; and since the order of Convolvu- 
lacee exhibit a great diversity in the form of the stigmatic 
surface and the proportion it bears to the branches or to the 
whole style, and as from these variations some of the best 
generic characters are derived, it is most essential that what- 
ever nomenclature be adopted, it be at least correct and 
precise. | 
The third and last division, also expressed with true Lin- 
nean brevity, will still less bear a close scrutiny. Divisio 1, 
(subtribus 1), ovarium 3-4-loculare. Divisio 2, ovarium 
2-loculare. Divisio 3, ovarium 1-loculare aut junius tantum 
2-loculare. From what has been above said of the nature of 
the transverse dissepiments in Convolvulacee, they being 
merely cellular expansions between the collateral ovules of 
each carpel, we might almost predict, à priori, that they would 
Prove of little importance; and we find not only that they 
are present or absent in species which can scarcely otherwise 
be distinguished, but that they, like other so-called spurious 
dissepiments, are often incomplete, the transverse section of 
the upper portion of the ovary showing it to be four-celled, 
