76 THE JOURNAL OF BOTANY 
A distinct plant, combining the aspect of crispus, structure of 
lucens, and with peduncles and spikes like some of Nolte’s speci- 
mens of P. nitens Web., but the flowers seem perfect. I know 0 
no species to which it can be compared or related, even from Mada- 
gascar, though the Mauritian Jucens form also occurs in that island; 
both were gathered by Bojer, who gave them a MS. name. The 
surface of the leaves is covered with what appears to be minute 
ots, each of which reflects the light; treated with boiling water 
or acids they appear (under a half-inch) as curled hair-like bodies ; 
they also occur on some species of Aponogeton, especially in A. sub- 
conjugatus Schum. & Thonn. 
P. oxypnyitus Miq. Prol. Fl. Japonice, Fasc. 7 (1867), 325. 
var. nov. Faurier.— Whole plant stricter in habit; leaves much 
more rigid, with the centre nerve consisting of 4-compacted ones, 
three on either side of it, connected by straight ones (the whole 
consisting of vascular-bundles), five, rarely six less distinct ones on 
either side, the leaf thus having 17-19 nerves. Spikes interrupted. 
The author of the species describes it as with 4-5 nerves on either 
side of the middle one, i.e. 9-11 in all. A linear-leaved plant from 
Japan, with strict leaves and stems, in habit like the type, but 
differing in the structure of the leaves, having as many as 17-19 
(very rarely 21!) closely-packed nerves, in this resembling P. 208- 
terifolius Schum., but with the blackish colour of the type. This 
colour can hardly be the result of the chemical composition of the 
water, as P. zosterifolius, which occurs rarely in Japan, retains the 
usual amount of colour. 
Hab. Japan; Shona, Faurie 39! 45! (mixed with P. oay- 
phyllus); Muori, Faurie 46}. 
at times partly obsolete ; stipules shorter. Peduncles longer, 
$-1} in.; spikes longer. Fruits rather smaller, less inflated, the 
dorsal face more crested (i.e. the carina is almost winged and 
waved); ventral tooth straighter and nearer the centre. 
aspect unsymmetrical. The Manchurian specimens correspond 
more with the latter. 
P. rtormanus Small.—In his Flora of the South-eastern United 
States, p. 37 (1908). Dr. Small has described this new Potamo- 
geton from the Blackwater river, Florida, May, 1886. It seem 
closely allied to P. natans, but Dr. Small tells me there are n° 
