43 
are crowded on the stem and its branches. Those which 
were collected in the same station in the year following, in 
water two feet deep, have such long internodes and pedun- 
cles (the latter from seven to nine inches in length) and 
such distant leaves on the flowering branches, as to appear 
to belong to quite a different plant. These two states of 
the same plant seem to represent the two varieties figured 
by Reichenbach in his “ leones Florae Germanicae et 
Helveticae,” Vol. VII., tab. xxxviii. and xxxix., which are 
thus characterised : — 
a. validus Fieber; stem robust; lower leaves subsessile; 
upper leaves shortly petiolate. 
b. elongatus, M. K.; stem elongate; internodes, leaves, and 
peduncles prolonged. 
The only Derwentwater flowering specimens I saw were 
very similar to the Cauldshiels Loch specimens of 1879, save 
that they were five feet long; while all the non-flowering 
specimens had short internodes in their upper portions. 
The Coniston plants on the contrary had very long inter- 
nodes, while their peduncles (which were very brittle) 
measured from eight inches to a foot and a half in length ; 
the stalk of the uppermost leaves measured from a quarter 
of an inch to an inch and a half. I have therefore referred 
them to the var. elongatus of Mertens and Koch, but 
Mr. Bennett considers that the Coniston plant is nearer 
to M. & K/s typical plant than the Derwentwater plant, 
although neither is the type as found in Germany and 
Sweden; but more like the French plant from the Loire. 
Potdmogeton Zizii differs from P. heterophyllus in having 
no floating leaves, and in its submerged leaves not being so 
sessile or narrow; it differs from P. lucens in having its 
stipules keeled instead of winged ; and from P nitens, and 
P. decipiens in its much longer peduncles and in its leaves 
not being amplexical or rounded at the base. It should 
be looked for in the Cheshire and other meres in the 
neighbourhood of Manchester. 
