BOTANICAL INFORMATION. 295 
St. Hilaire, as to the Brazilian species. There are but three 
genera, easily distinguished from each other; but the nume- 
rous species of Utricularia are rendered more difficult by the 
excessive delicacy of their flowers, making it often scarcely 
possible to describe them accurately from dried specimens. 
De Candolle's first divisions of the genus are derived chiefly 
from the remarkable differences in the organs of vegetation, 
and, in good specimens, are only attended with one rather 
singular inconvenience, the difficulty of distinguishing be- 
tween their roots and leaves. "Taking all these drawbacks 
into consideration, De Candolle’s characters very much facili- 
tate the determination of those Utricularie (above 100 species) 
which he was enabled to describe; but there are many in our 
herbaria which he did not then possess; amongst others the 
splendid U. Humboldtii, figured in the 15th vol. of the Trans- 
actions of the Berlin Horticultural Society. 
The materials of which Prof. Alph. de Candolle has chiefly 
availed himself for those Orders which he has elaborated 
are, besides his own very rich botanical library and extensive 
herbarium, those of MM. Edm. Boissier and Phil. Du- 
nant, of Geneva, both of which, and especially M. Bois- 
sier’s, are now becoming very important. Amongst the 
collections generally distributed, to which Prof. de Candolle 
is thus enabled to make special reference, so as to facilitate 
the arrangement of those herbaria which also contain them, 
may be mentioned very full sets of those of Berlandier from 
Mexico, Salzmann, Blanchet, Lund, and generally of Martius 
from Brazil, A. Gay and Bertero from Chile, and more or 
less perfect sets of those of Schomburgk from British Guiana, 
Leprieur from French Guiana, Hostmann from Dutch Guiana, 
Gardner and Vauthier from Brazil, Andrieux from Mexico, 
Mathews from Peru, Hartweg from Mexico, Guatemala and 
Columbia, Heudelot from tropical Africa, Drège and Krauss 
from South Africa, Bojer from Madagascar and Mauritius, 
Cuming from the Philippine Islands, Kotschy and Schimper 
from N.E. Africa, Zollinger from Java, and a set, in some 
cases complete, in others considerable, of the East Indian 
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