Professor Henslow's Catalogue of British Plants. 395 
ralized j in the latter, the amount of suspicion touching human 
agency in their introduction, would be the proper criterion. The 
whole question is still quite open to discussion, and we hope that 
the example, set by Professor Henslow, will stimulate others to pur- 
sue the same subject. 
We cannot devote the space necessary to give many examples of 
our author's views, but the selection of a few genera will render the 
plan sufficiently intelligible. The genus Fumaria has six varieties 
and species, all of them being marked as belonging to the " possibly 
introduced" class. F. qfficinalis and parviflora are given as admit- 
ted species ; capreolata and Vaillantii are held to be questionable 
species ; media and leucantha are considered to be varieties ; the for- 
mer being distinguished as one admitted to be a species by De Can- 
dolle. In the genus Papaver, we find P. nudicaule considered as a 
species that ought to be altogether expunged from our Floras ; som- 
niferum is marked as a species certainly introduced, the other four, 
hybridum, argemone, duHum, rhceas, rank as possibly introduced 
species ; the maritime form of Argemone being named as a variety 
of that species. Tormentilla reptans is sunk into a variety of T. offi- 
cinalis, which latter is properly referred to the genus Potentilla. 
Oenanthe apiifolia, in like manner, is joined to O. crocata : Veronica 
agrestis, polita, and Buxbaumii are all admitted species ; the latter 
being considered as certainly introduced. Potamogeton oblongus is 
rejected ; lucens and heterophyllus are united as two varieties, under 
the name of proteus ; rufescens and lanceolatus are questionable 
species. 
The author gives a numerical table of British species, &c. so far 
as his Catalogue extends, that is, to the Algae inclusively. Of the 
Acotyledones, 1406 species, or 1583 species and varieties together, 
are enumerated. The Phanerogamse are thus stated : 
Species, or with Varieties. 
Indigenous (including the possibly introduced,) 1382 1650 
Naturalized, 57 62 
To be expunged ? 56 58 
Total, 1495 1770 
It is deserving of notice, that the author of the Catalogue has al- 
together discarded the use of capital letters in writing specific names, 
while in the last edition of the British Flora, the use of capitals in 
this way has been considerably extended, by adding them to all ad- 
jectives expressing the names of countries, as Gallica, Anglica, &c. 
The omission of capitals gives a neater and less crowded appearance 
