52 
leaves whorled in threes and fours, pectinate, longer than the 
flowers, the staminate opposite or alternate, entire or serrate, 
shorter than the flowers; staminate flowers alternate, the pistil- 
late alternate or in more or less imperfect verticils. Probably 
this plant occurs in all parts of the lake, and may be looked for 
within our borders as well as in Canada. 
POTAMOGETON PAUCIFLORUS, Pursh, var. NIAGARENSIS, 
Gray. The writer had the pleasure while on the excursion to 
Niagara Falls given to the members of the A. A. A. S. at 
Buffalo last summer, of rediscovering Tuckerman’s old species 
(P. Niagarensis, Tuck.), which had not been found since Tucker- 
man’s own collection of it forty years since. Search has often 
been made for it, but without success, and botanists had nearly 
concluded that it had disappeared from the original habitat. It 
seemed to be plentiful in the canal or sluiceway running along 
the brink of the bank on which the village stands, near the street 
leading down to Goat Island. 
EQUISETUM LITTORALE, Kiihlewein. An Equisetum grow- 
ing on the gravelly shores of Knight’s Island, Lake Champlain, 
has excited a good deal of curiosity and some dispute among 
botanists who have collected it in situ. By some it is thought 
to be F. variegatum, Sleich., and by others £. littorale, Kiihl. 
Specimens of this plant which I collected a year or two ago were 
sent to Mr. A. Bennett, of Croydon, England, and Dr. G. 
Tiselius, of Stockholm, Sweden, both of whom have kindly sub- 
mitted it to good authorities on this family. Mr. Bennett writes 
that he himself and Mr. W. H. Beebe, who has paid particular atten- 
tion to this order, regard it as undoubted &. littorale, Kithl. Dr. 
Tiselius informs me that Prof. Th. Fries, Director of the Botanical 
Gardens at Upsala, and Dr. Sigfr. Almquist, of Stockholm, both 
pronounce it Z. /ittorale, but that they consider that species a 
hybrid between £. arvense, L., and E. SJluviatile, L. It would - 
seem, therefore, pretty certain that the Knight’s. Island form, 
whether the opinion of its hybridity is correct or not, is distinct 
from £. variegatum, and is the plant known as £. littorale, Kuhl. 
[An account of the occurrence of Equisetum littorale in Eng- 
land, by Mr. Beebe, may be found in the Journal of Botany, vol. 
_ xix., p. 54.—ED.] : 
