126 THE JOURNAL OF BOTANY 
very interesting North American species, P. Robbinsii Oakes, and 
I described the plant as Lies in Bull. Herb. Boissier, 1896, p. 257. 
The authors say: ‘‘ Specimina vaikienn floribus fructisque carent. 
Habitus omnino P. obtusifolit, foliis autem sub lente tenuiter arguta 
serrulata.” 
There is in the Kew Herbarium a specimen named ‘ P. crispus 
y ser aaa Schrad. Yokohama, Japan, 1862, ex Science Coll. 
mp. 
uccin differing considerably in habit from the usual form of 
rs Robbinsii, I could senie no good characters by which it could be 
separated as a spec P. Robbinsit very eae fruits; for years a 
single fruiting ee, gathered in Oregon by Hall, was the only 
xample known, ut it has since been gathered i in Jamaica Pond, 
Massachusetts (Hill); Chiesgo Lakes, Minnesota; Hbées Lake, 
sete a seated ; and in the Somas river at Alberni, in Vancouver's 
oa oe 
Japa 
P. Miduhikimo Makino, and P. nipponicus Makino; the sehr 
for this last is scanty, and it is perhaps a form ‘of some other 
th 8 
m WGA eee China proper, and Ussu uria ; * Leppert 
P. javanicus Hassk., an hina, Africa, Australia; P earth 
Roxb., from Tibet to ae and the Andaman Isles; P. gracilis 
Wolfg., Siberia and North Europe: while of European species 
P. prelongus Wulf., o natans Li, P.- polygonifolius Pourr., 
P. fluitans Roth, P. alpinus os P. heterophyllus Schreb., 
P. nitens Weber, P. perfoliatus L., P. crispus L., P. zosterifolius 
Schum. .. P. peees be FP, pectinatus ce and P. a Fao 
cie C 
seems rae ect ayphyllus w with P. suaeapoits acu 
section). Pathe Fourie’ s No. 1058 in the Paris Herbarium may 
also be a new species, allied to P. trichoides, or - may be scinnatate 
P. Miduhikimo, but the material is insufficient for description. 
Nowhere else in the world can such an sacle of species be 
foun 
It may be of interest to American botanists to know that 
P, Robdbinsii was first collected by Nuttall at Cambridge, Mass., 
and was indicated by him as a new species; specimens from him 
are in the British Museum and Kew herbaria, and also in De Can- 
dolle’s herbarium, where it is stated to have been collected in 1825. 
P, nrrens Weber, Suppl. Fl. Holsat. p. 5 (1787).* 
Some time before his death, my friend Dr. Morong wrote me 
concerning some specimens of adios from Wenham Lake, 
U.§.A. Some of these specimens he had sent to Dr. Tiselius, 
This is a rare book, and I am not aware that there is a copy in this 
untry, so it ee eg well to say that the description is reprinted in this 
Sotaiial for 1896, p 
