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THE NOMENCLATURE OF POTAMOGETONS. 301
of fruit remind one at first glance of those of P. DrummoiuUi
Bentliam.
P. Oakesianus Robbins in Gray's ' Manual of North United
States,' ed. 5, p. 485 (18G8). — I believe this to be the L'. yHttalil
Cham, et Schl. (in 'Linnea,' ii. p. 226, 1827), and the P. Purshii
(name only) of Tuckerman in ' Silliman's Journal,' 1848, p. 228.
P. ALPiNus Balb. X pknsylvanicus Cham. — A plant sent by the
Rev. T. Morong from " Lake Champlin, at Fcrrisburgh, Vermont,
U. S. Coll. C. E. Faxon, 18-8-82, supposed to be a form of /'.
rvfescens Schrad." I would suggest this may be an hybrid. Mr.
Fryer has remarked, " ^Vhy not P. Grij/ithiif " and I must allow
the likeness to that plant is remarkable. Still I cannot certainly
place it there ; and I make the above suggestion as I am not able
to place it elsewhere. Perhaps American botanists who may have
tbe opportunity will study it growing.
P. AMBYLLPHYLLus Beck. aud P. vERTiciLLATUS Lesqucreux, two
fossil " species," had better be re-named, as bearing names applied
to recent plants.
P. FiLiFORMis Nolte, Nov. Fl. Holsat. (182G). — It is not easy to
decide what name this plant ought to bear. The followmg have
been referred to it :
P. pmilltis jiidtaiis Bocc. Ic. et Descrip. Rar. Sic, &c., p. 42,
t. 20, tig. 5 (1074),./7