145 : 
in Fresh Pond, Cambridge, Mass. (see Wood’s Class-Book, 1874) 
and at Dallas, Texas (this Journal, 1872 p. 23). This station here 
makes the third east of the Mississippi, so far as I know. But 
one species has been found east of the Rockies, and another in 
California. Among the first notices of this plant is a communi- 
cation from Braun to Dr. Englemann, published in Silliman’s 
Journal, 1847; and one of the best descriptions with figure will 
be found in Meehan’s Flowers and Ferns of the U. S., Vol. II. 
‘ Wo. H. SEAMAN. 
[Marsilia quadrifolia has been reported as naturalized and 
fruiting abundantly at Dedham, Mass., by Mr. Henry L. Clapp 
(See BULLETIN, viii., pp. 127 and 144). In Underwood’s “ Our 
Native Ferns and their Allies,” pp. 114, 115, six species of Mar- 
stlia are recognized; all of which are reported from stations to 
the east aud southeast of the Rocky Mountain region.—ED. ] 
A New Species of Potamogeton, 
POTAMOGSTON CURTISSII.—Plant simple or occasionally 
branching, a little upwards of a foot in height; stem and branches 
slender; leaves all submerged, linear, 4-5 cm. long, 14-1 mm. 
broad at the widest part, tapering gradually to a point, the midrib 
with two very delicate nerves or a loosely reticulated space on 
each side of it; stipules hyaline, obtuse, 7 or 8 mm. in length; 
peduncles 8-15 mm. long, somewhat clavate, erect, axillary and 
racemosely disposed, five or more of them at intervals of one or 
two inches along the upper part of the stem; flowers small, four 
or five; spikes capitate ; fruit not seen. 
Collected last May in the Blackwater river, Northwest Florida, 
by the indefatigable explorer of that State, Mr. A. H. Curtiss, for 
whom it is named. 
Mr. Curtiss also. sent what appears to be a peculiar form of 
P. natans. It has small, acute, elliptical leaves, 4-6 cm. long by 
5-15 mm. wide, and erect peduncles about 6 cm. long. — It looks 
exactly like specimens in the Torrey Herb., from India, which 
are labelled P. natans var. 
Any botanist who may discover this apparently small natans 
in fruit, would confer a great favor by sending specimens to the 
writer, THOMAS MORONG. 
