THE NAIADACEE OF NORTH AMERICA. 185 
difficulty as to the name this ought to bear will, we think, be 
disposed of by calling it P. epihydrum Rafinesque 1808). 
‘ ong is wise in retaining Tuckerman’s P. Lonchites for the 
present ; there is yet a difficulty as to this, and two or three of the 
forms of P. fluitans. It should be given for Porto Rica and Antigua. 
We do not think Dr. Morong has done well by making P. Faxoni a 
species ; some of the specimens are really rank Poe but P. Lonchites, 
others may be hybrids. P. heterophylius occurs in Greenland! an 
Arctic America, 56°! P. a ana ws (Zizit Roth.) occurs in 
Cuba (IWright!). To the cate bution of P. lucens L. may be 
added Florida! Jamaica, Cuba ike ! and Texas 
. per- 
foliatus L. also occurs in St. icin! P. crispus L. is considered an 
men in 
D3 believe specimens for Central China (Dr. Henry!) belong to 
P, Hillii Morong. Unfortunately there is no fruit on Dr. Henry’s 
specimens, but in all else they seem identical. 
Dr. Morong de P. foliosus = P. pauciflorus Pursh) as 
td Cu to N. America, but it has (besides occurring in Porto Rico! 
d )a 
a 
currents ... . strike the erie ay group (Sandwich Isles) from 
the north- west, bringing huge pine logs from Oregon.” Judging 
from the account of the bird- life of these islands, } they could have 
little to do with the transportation of an aquatic plant. Perhaps 
the Brazilian specimens named ‘‘pauciflorus"’ may really be tenwi- 
florus Philippi? The var. californicus of this occurs also i 
Mexico ! 
On page 41 Dr. Morong introduces a form of nomenclature a 
seems to us much to be condemned. He raises P. pusi . var. 
major Fries to specific rank as ‘‘ P. major ae reat os At while 
) 
P. Friesii Ruprecht! We think there is a prior authority for the 
reducti P. panormitanus Biv. to a variety. P. pusillus should 
ha 
P. heterophyllus, F). Paris, 1790” ; but here Pentagna Inst. vol. ii. 
289 (1787), _— mes been ig ed. Dr. Morong has no Segre 
record for P.h 
* Wallace, Island Life, 2nd ed. p. 3 
+ Brigham in Proce. ge Dee, of ee Hist. p. 12, 1868. 
t Wallace, l.c. pp. 313 
