31 
ing, sometimes very broad. Peduncles 3-6 inches long, scarcely 
thickening upwards. Spikes 2-2% inches long, very thick cylin- 
drical, fruiting freely late in the season. 
Fruit about 177 lines long and 1 Y lines broad, roundish ; keels 
small, often obscure ; face usually with a slight inward curve at the 
base; style nearly apical; apex of embryo pointing transversely ` 
inwards, but the curve less than in No. 12. 
The typical form of our species approaches most nearly to the 
European form called var. ovalifolius, M. and K., as the uppermost 
leaves are generally oval or ovate in outline. Those remarkable 
forms, so common in Europe, and known as var. cornutus, Presl., 
var. longifolius, Gay, and var. acuminatus, Schum. never occur in 
our country, so far as I am aware, but they are approached by the 
submerged foliage of P. ///inoensis.* 
Var. CONNECTICUTENSIS, Robbins, in A, Gray, Man. Ed. 5. 488 
(1867.) 
This seems to be a good variety, but very rare. As stated by 
Dr. Robbins, the stems are flexuous, the leaves acuminate, and the 
fruit larger than in the type (134-2 lines long and about 1% lines 
wide), distinctly tricarinate and with a facial style. It has been 
found only in Saltonstall’s Pond, East Haven, Conn. (Robbins), 
and Pine Plains, N. Y. (Hoysradt) Forms resembling this were 
obtained by E. Faxon in Lake Dunmore, Vermont, but without 
fruit. 
The typical /ucens is not very common in this country. It 
occurs rarely in Nova Scotia and Ontario (Macoun); Fresh Pond, 
Cambridge, Mass. (Morong); Lakes Cayuga, Onondaga and 
Oneida, N. Y. (Dudley, Morong.); Pine Station, Indiana (Hill). 
» Attributed to Fla. by Chapman (Chap. Fl); and to Mission 
Dolores, Cal. by Brewer and Watson (Fl. Cal) It has also been 
collected by Pringle in the State of Michoacan, Mex. (No. 3327, 
wrongly named Р. 22221). Cuba (Wright). Common throughout 
Europe, Asiatic Russia, and other parts of Asia. (Plate apre 
*Mr. A. Bennett in his recently published list of the Potamogetons in the Vienna 
rium (Ann. der. K. K. Naturhist. Hoffmus. for 1892, p. 290), notes in that 
керді a specimen of Р. longifolius, Gay, gathered іп Oregon by Dr. Lyall. 
