NOTES ON POTAMOGETON 129 
of those known. It seems sufficiently distinct in its fruit; in the 
upper and lower leaves the nervation is the same and so is the habit 
the spik in. Moron Am. Naiad. p. 18) says of Claytonit, 
‘* peduncles specimen from Has 
Canada (Prof. Macoun), the peduncles are from 3 to 42 in. long; but 
the plant is evidently unusually elongated, and the spikes proceed 
from intermediate pare an unusual thing in this species. On 
another from Uxbridge, Mass., the peduncles are 4 in. long ; out of 
n my 
2537) the peduncles and spikes a like sc/eropus ; the speci- 
mens are only in bud, but the bear is apt rightly referred to 
Claytonii. hay w ant the characteristic lower leaves of ec nas 
but in habit are between Claytonii and scleropus. I believe they 
grew in running water, while Claytonit is usually a lake — pond 
12 to 27 (Morong). But in specimens of the same width as scleropus 
they are the same. Unfortunately, my specimen of scleropus has only 
the immature fruit, but I suppose that figured by Dr. Schumann 
r. xX 9” would be mature, and this with the section “x 10” 
aa seem to distinguish it suffic iently f rom P. Claytonii. The 
figure shows the e mbryo only coiled two-thirds of a cirele, while 
that of Claytonii is Pawan 13 times”’ “tie ng). 
CHITES Tuckerm While writing on North American 
it is quite possible Nolte had seen them, as some of the herbarium 
sheets of Potamogeton at Berlin are noted by him, and he was 
contemporary with Chamisso. 
When describing P. Claytonii, Tuckerman (in Silliman’s Journ. 
Ist ser. xiv. 88, 1848) referred the ‘‘ P. foliis lanceolato- oblongis 
petiolis longis” of Gronovius (FI. Virg. 189, 1762) ‘‘ex parte certe”’ 
to that plant; but Clayton’s type (no. 664) (in n Herb. Brit. Mus.) is 
certainly P. lonchites. In the fuller account of P. Claytonit in the 
same journal Ond er. vi. 228 (1848), he omits this reference. 
Under P. nitens I ins ise Laas Claytonit and /onchites are cross- 
named by American collec young elongated specimens of 
Claytonti bear at first sight peat likeness to lunchites. 
[The following note may be added here 
P. sparaut#rormis (Robbins) itavong 0 N: Amer. Naiad. p. 26, 
t. 85. Dr. Morong adopts this name from Asa et 2 8 Manual, ed. 5, 
p. 487 (1878), where it stands as “ Var. ? * under 
P. gramineus ; and the same name is vateinod's in “iehat is kno own as 
fae: “ spor octal Check-list ’ and in Britton and Brown’s Il/ustrated 
Flora. The name, however, is based on the assumed permanence 
of the wsidak: name and on an exaggerated application of the 
