248 THE JOURNAL OF BOTANY 
of the undetermined but named forms. In one county in England 
gem re I venture to say ae in a ditch ay friend Mr. Fryer 
and I could find some twenty so-called vari in P. angustt- 
z 
may safely be ween’ cee seven-tenths of these woul revert 
back to type in a yea so’s cultivation. They of great 
value as a means of cin inter-variation in other ae but 
they are the variation of yarioties, not of species. n the other 
hand, I believe, as Sir J. D. Hooker observes in the preface to the 
third edition of the Students Flora, that the plants may assume — 
one facies in one cou A and another in another. This is endemic 
waters are ‘“dydled” or ak out now and again, and then 
the ima | is not able to reach the water-surface, and hence is 
submerged. 
If other countries come to be investigated as sce as cures 
arts of Europe have been, and we allow that the gen 
about one-half of the world, in another fifty years oy reat hake 
(allowing the same ratio of fifty-six varieties to each country) the » 
large number of five thousand six hundred varieties in the genus ! 
srs. Ascherson & Graebner’s work should be taken by 
e 
cultivated specimens sent me from a | ebolent of tho genus under 
names bars certainly were never given to them by the sender. 
oGEToN Faxont Morong. Dr. Graebner (Das Pflanzen- 
reich, 75) throws no further light. on this perplexing plant. Mr. 
Faxon’s specimens gathered on Aug. 11th and 19th, 1882, “Little 
Otter Creek,” U.S.A., must retain Dr. Morong’s name, and 
believ P. americanus (lonchites) Cham. x pensylvanicus 
am. But the first specimens sent me Dr. Morong fro 
“ Lake Champlain, Aug. 18th, 2, C. E. Faxon,” are certainly 
another plant, and are, I believe, P. alpinus x pensylvanicus. The 
submerged leaves might well pass for alpinus, the — cles and 
spikes are a combination of the two, and the floating leaves are 
nearly those of pensylvanicus. Thus following a custom dis- 
sca of by many sonar I propose to call it x P. oth an 
PLAINII 
