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ART. VI. Remarks on the Genera CaALLiITRICHE and ELATINE. 
By G. A. WaLKER Arnott, F.L.S. &c. (In a Letter to the 
Editors.) 
CaLLITRIcHE.—It is known to most of your botanical readers, 
that Sowerby continues at present the English Botany : six numbers 
have appeared. In one of these, Tab. 2606, is a figure of “ Calli- 
triche autumnalis,” with a description by Dr. Hooker. I take this 
opportunity of observing that the species there figured, is neither 
the plant of foreign authors, nor does it accord with the description 
given by Smith in the English Flora. Of this Dr. Hooker was I 
believe aware, and he has judiciously drawn up his description from 
similar specimens to those figured and transmitted to him by Mr. 
Borrer, from a ditch at Amberley in Sussex. I likewise am in- 
debted to the same botanist for specimens which enabled me to as- 
certain its difference from the true C. autumnalis, a plant that I 
have myself gathered abundantly in the only known Scotch locality, 
the loch of Clunie.* ' 
To the description of Mr. Borrer’s plant, I can add little to what 
has been already said by Dr. Hooker: it seems to be more allied to 
some states of C. verna than either is to C. autumnalis, but from 
both it is I think very distinct, by its much more delicate appear- 
ance, and by having the fruit always on very distinct peduncles, 
and not subsessile, as in the two others. This circumstance must 
at once suggest the specific name, and indeed it is the C. pedun- 
culata of De Candolle, said hitherto to have been found only at 
Fontainbleau and Angers in France. 
I shall now give the specific differences of the three species ; and 
as they are not exactly the same with those given by other bota- 
nists, I shall subjoin a few observations, by means of which I trust 
they may be better understood. 3 
1. C. verna; fructiferous peduncles very short, with two bracteas 
at their base; fruit regularly tetragonal, each portion obtusely cari- 
nate at the back. 
Of this many species have been made, but the only differences. 
* Tn your last Number, p. 376, it is stated that Mr. Balfour had discovered a 
new locality for the Convallaria verticillata, hitherto supposed to be confined, 
in this country, to the parish of Clunie. The clergyman of that parish, how- 
ever, (Rev. Mr. MacRitchie,) has long made me acquainted with the station in 
Craighall woods. I may here also take notice of the two new additions to the 
English flora, mentioned at the bottom of p. 381. Ofthe Reseda alba, [have long 
possessed specimens from a very different part of the English coast; it was ori- 
ginally discovered by Mr. Christy ; but though it be the R. alba of De Candolle, 
it is not so certainly the plant of Linneus. It appears, however, to be the R. 
undata, Lin., and I do not feel certain that R. fruticosa, Hort. Kew. is diffe- 
rent. As to Myosotis collina, its essential character is to have the segments of 
the calyx short, and when in fruit very patent: what I have seen on Arthur’s 
Seat has the segments of the calyx connivent, and is not distinct from MM. ar- 
vensis. 
