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perfoliatus, erispus, and densus—most of these abundantly. Last come 11 with 
leaves linear and grass-like. Of the grass-leaved forms we have six; obtustfolius, 
mucronatus, pusillus and tenuissimus, pectinatus, and flabellatus. Pusillus alone 
of these is widely spread in Herefordshire; the rest are rare or local. Thus it 
will be seen that of the 30 plants in this genus known in the whole of the British 
Isles, Herefordshire is known to possess 15 or 16—just half. Among these is one of 
the very rarest of all, not known elsewhere in the British isles: and it is of this 
one, together with a few other of our less common species that I proceed now to 
speak. 
In doing so I want to bespeak the particular attention of botanists who have 
any opportunity of giving it, to the Pondweeds of the river Wye during the 
present summer—-bidding fair as it does to be one of exceptionally low water and 
unusual probability therefore of obtaining Pondweeds in flower and fruit. I now 
mention one or two rarer species in order. 
Potamogeton polygonifolius. This widely distributed plant is quite a rarity 
with us. The moorland form with small neat leaves is still a desideratum ; but a 
form of this plant almost equalling P. natans in the size of its upper leaves exists 
in several spots. It used to occupy the Dam pool on Howle hill near Ross, and 
now that the pool is destroyed, it is still to be found in the stream which supplied 
it. I found it last year, fruiting, in the Grwyne valley ; and I saw it this spring 
occupying ditches in what is left of Moseley Mere and Kingswood Common near 
Kington. The moorland form should be met with on the Llanthony hills ; but I 
never succeeded in finding it there, until a few days ago, when I stumbled upon it 
in the head of the Olchon brook where it is still a moorland rivulet. 
Potamogeton rufescens. Mr. Crouch has furnished me with a fine fruiting 
specimen of this plant. Unfortunately, the station at which it was gathered 
was forgotten. It will therefore rest with the diligence of local botanists, especially 
in the north-western districts of the county, to settle whether it is to be placed 
on our Herefordshire lists or no. 
Potamogeton salicifolius, Wolfg. This very rare plant can now I think 
be accepted as an undoubted inhabitant of the Herefordshire Wye. I have 
an old specimen gathered by Mr. Purchas in 1854 at the New Weir, Great 
Doward, to which he does not with certainty assign any name. I gathered 
it myself in 1866 at Sellack, and misnamed it the utterly different ‘crispus.’ In 
1877, I sent it to Prof. Babington, who gave it the name of ‘ salicifolius Wolfg.’ 
under which name I sent it to the Exchange Club in the following year. No com- 
ment was vouchsafed upon it by the authorities of the Exchange Club: but last 
year I had, through the courtesy of Mr. A. Bennett of Croydon, the benefit of the 
opinion of the Rey. T. Morong, an American botanist, who is now monographing 
this genus, upon the Wye plant. He writes as follows: ‘This plant you say 
Dr. Boswell regards as equalling our P. Lonchitis, Tuck. ; I should disagree with 
him decidedly. It certainly is not our Lonchitis. But I have no doubt that it 
is P. salicifolius, Wolfg. I have laid it side by side with specimens of that from 
Sweden (so named by the botanists of Upsala), and they are as nearly alike as 
two peas. Neither of these are in fruit, however ; but if their fruit should prove 
