128 THE JOURNAL OF BOTANY 
the leaves is seen in both, and is not the result of drying. The 
stems in the specimens I possess afford no character in section, 
but they are so desiccated that nothing I have used will act on 
them ; and the structure of the leaves affords no certain test. The 
plant must be left doubtful until better and more abundant material 
is forthcoming. 
P. uateratis Morong in Bot. Gaz. y. 51 (1880); N. Am. Naiad. 
t. 52, p. 44. on 
The only species I know that can be compared with this is 
P. Miduhikimo Makino, Il. Fl. Japan, v. 1, No. 9, p.2, t. 54, 1891, 
especially the separate piece in the lower left-hand corner, though 
ave some suspicion that this may have been drawn from a piece 
of P. javanicus Hassk. ; the two are often mixed together in gatherings, 
and are not easy to separate unless in fruit. These two and P. cris- 
tatus Reg. aack, along with specimens from Japan named 
** P. hybridus Michx.,” have been much mixed together and cross 
named. P. hybridus is not know om Japan should not be 
surprised to see the combination of paucijlorus Pursh Xx hybridus 
Michx., suggested for lateralis, or, to follow Dr. Morong’s nomen- 
clature, foliosus Rafn x diversifolius Rain. 
P. mysricus Morong, Bot. Gaz. v. 50, 1880; and N. Am. Naiad. 
t. 41, p. 84. 
is 
to be of hybrid origin. It much resembles (especially the flowering 
i 
sp 
which the early American investigators of this genus found so many 
of their plants.”"—Morong, 1. c. Specimens of the plant are in the 
a. 
P. srenostacnys Schum. in FI. Brasil. iii. 687, t. 119, fig. 1 
(1894), 
Dr. Schumann kindly sent me a specimen of this for inspection. 
It seems to me most to resemble a large polygonifolius. I have seen 
in that species the development of the stipules almost as great as In 
stenostachys ; but at present the material is too scanty for any positive 
conclusion. 
Oley Schumann in Fl. Brasil. iii. 688, ¢. 120, fig. 2, 
1894. 
By the kindness of Herr Baagoe, of Nested, Denmark, I possess 
a specimen of Dr. Schumann’s plant. In the Flora Brasiliensis 
nothing is said as to its affinities. Broadly, it is the South 
American representative of the North American P, Claytonii Tuck. 
(P. epidydrum Rafin.), and is probably the nearest to that species 
* See Journ. Bot, 1895, p. 373. 
