NOTES ON POTAMOGETONS. 241 
amineus, Li,, var. maximus, Mo orong (heterophyllus, Schreb., 
var.),—Specimens I gathered last year in Burwell Fen, Cambridge- 
shire, I was unable to refer to any British form of the “ gramineus ”’ 
of Linn. a oy yt and the only specimen I could find 
resembling them was one in the ae Herbarium, labelled “ Canada 
West, Pree Macoun.” The receipt of specimens of Morong’s 
plant enabled me to at once identify them with it, and I am glad 
to say he concurs with me. He remarks :-—“ It seems _just the 
same as our gramineus var. maximus. Oar ant grows in rivers, 
generally in strong currents. It varies from the typical forms of 
gramineus, being less branched, and entirely without th otomous 
ramification of the branches so common in the grass-leaved form. 
The leaves are far fewer and scattered along the stem. Some of 
the submerged leaves are nearly an inch wide by seven long. Were 
it not that the so-called var. graminifolius is intermediate, I should 
be disposed to separate the large form from gramineus altogether. 
Your plant being from ‘a ditch’ shows that it is not the current 
alone ‘sata causes the diffaress, as its locality with us would seem 
to indica 
fee Pelonbbk Wulfen. ~The esas interesting Peg Thave 
from the Rev. T. Morong :—* This species has with u urious 
habit. It fruits and flowers very late in the autumn (Nov. "6 Dee.), 
and the spikes hang on all winter under the ice. My specimens 
in spike are, as you see, collected in July, and all that have been 
sent me were old spikes of the previous we collec ve in summer. 
Has any he ae botanist noticed the same thing 
P. perfoliatus, L., var. lanceolatus, A. Gry: co AST agree- 
ing with the Un ited hitea plant I have from Scotland (Mr. A. 
icon ye The leaves are two ira a half to three and a mi 
ks very peculiar fot of perfoliatus Foci Italy (Prof. Caruel) “ey 
the leaves stiff, strongly undulated at bee edge, and of a very dense 
texture. Another from Hungary (Herb. Dr. Kovats) has very stout 
stems and ikea, s, with the fruit with remarkably long pedicels, 
and oy whole plant of a peculiar greasy appearance. lender 
form pa long peduncles occurs in Looe Pool, Helston, Cornwall 
(Mr. BH. Straker), agreeing with specimens from Mass., U.S.A. 
an T. iP ah ng). 
us, L.—Specimens with the ‘“ winter-buds,” gemme, or 
Upbetonelin: ’ occurred plentifully on Mitcham Common, Surrey, 
this spring. I do not think they are mentioned in any of our 
floras. They are figured in ‘ The Phyto. sea er n.8., vol. ii., p. 69, 
1862; see also Trans. Bot. Soc. France (1856), v vol. iii., ?. 350. 
They occur in North America, accompanied by others at the end 
of the shoo 
on 1 the back when dry. It is se ee the var. of a. major (Fieber, 
Die Pot. Boh. 1888, p. 35). : 
I 
