BOTANICAL EXCHANOK CLUB. 
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leaves, enlarged petals more or less denticulate.” Eivor banl-;, 
Ivelvedon, Essex. 1876. E. G. Vakenne.— This seems to me tlie 
same as 11. maximus, from Lewes, Sussex, and St. Germans, E. 
Cornwall. I raised numerous seedlings of the Sussex plant, and 
also had some sent me by Mr. H. C. Watson, but I am sorry to say 
they have all died off. — J. T. Boswell. Is not this R. maximus ? 
That is a plant I know very little about — C. C. Babington. 
“Piiimex, near maximus ; one root with every variety of base to 
the root-leaves between cordate and attenuate.” Bitch, King’s 
Caple, Herefordshire. August, 1876. — Augustin Ley. This seems 
true Hydrolapathum, with which it agrees in the shape and size of 
the enlarged sepals. It is now established beyond a doubt that 
true Hydrokcpathum does vary in the shape of the base of the root- 
leaves. In connection with this I may mention that the leaves of 
the seedling plants of the Sussex maximus, mentioned above, were 
undistinguishable from seedlings of the Thames- side plant of the 
same age. Both had the leaves rounded at the base, neither cordate 
nor attenuated. — J. T. Boswell. 
“ liumex maximus." Barcombe, bej'ond the Mill. Eiverside. 
Sussex. August 28, 1876. Qua the jianicles, this plant is even 
more like the continental specimens of “ maxiums ” than the Lewes 
specimens, from which it greAV distant some three or four miles. 
The perianths are more extreme both in shape and in serration. 
Yet the subjoined root-leaf, which clearly belonged to this panicle, 
is “ Hydrolapathum." No doubt the plant is not a healthy one. 
Old Shoreham, West Sussex. August, 1876. — J. L. Warren. The 
Barcombe plant is, I should say, unhealthy Hydrolapathum. I 
cannot see that it has the enlarged sepals of maximus. The Old 
Shoreham one I should also call Hydrolapathum. The fruit sepals 
are too long in proiioidion to then breadth for R. maxiums, — they 
are triangular, not at all deltoid. — J. T. Boswell. 
Polygonum Persicaria, Linn., b. datum. Among weeds in an 
arable field, Trevol, near Torpoint, E. Cornwall, September 19, 
1876. I sent this to Dr. Boswell as the elatum of ‘ E. B.,’ ed. iii., 
but with the following remarks : ‘ I am somewhat doubtful about 
this, and shall be very glad of Dr. Boswell’s opinion concerning it. 
It grew with Setaria viridis and one or two aliens [Amaranthus 
retrojiexus, &c.), so perhaps sprang from seed introduced in some 
way.’ — T. E. A. B. This is the plant which I mentioned under 
that name in ‘E. B.,’ ed. iii. It came up in vast quantities in 
Battersea Fields when they were being converted into Battersea 
Park, and had large quantities of mud from the bed of the Thames 
laid on them. It was accompanied by Setaria viridis, S. italica, 
S. glaiica, Echinochloa Crus-yalli, and other aliens. — J. T. Boswell. 
Polygonum sp.) Side of the path by the Almond, below 
Cramond Bridge, Edinburgh. August 26, 1876. I shall be glad 
to know if this is P. Persicaria b. elatum of ‘ Loud. Cat.’ Only 
one plant seen. — F. M. Webb. Plant without glands, as in the 
Persicaria forms. It seems to me the same essentially as the 
Trevol examples, allowance being made for its having grown in a 
more confined situation. — T. E. A. B. 
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