Potamogeton.} OXXXVIII, NAIADER, 173 
slender, terete or somewhat flattened. Leaves all ipee alternate 
except under the peduncles or branches. where they are ma pe) 
rr 
with the upper end obliquely reflexed.—F. Muell Fragm., viii. 216; 
dg le. Fl. Germ. t. 25: P. Maii R. Br. Prod. 348 ; Hook. 
f. Fl. Tasm. ii. 42 and of some other 
N.S. Wales. Ponds near m Spip a R. Brown ; Camden county, Miss — 
Atkinson ; New England, C. Stu 
Victoria. Yarra and HT. ACRES hy F. Mueller and others. 
Tasmania. South Esk River, Gunn, C. Sti 
S. Australia. Torrens River, F. Mueller. 
The Linnean names P, gramineus and P. compressus have been so variously applied 
this e following species, as well as. to the varieties of some of the hetero- 
a 
Den P.o Sipp is onè of the most pios qmd over the area of the genus. 
ckerman defines the N. es meriean form as having the upper curved end of tbe 
embryo (and seed) horizontal; I have found it very TM DIA slightly or much curved, 
sometimes almost coiled, € reflexed, but I have never scen it horizontal. 
acutifolius, Link; Kunth, Enum. iii. 185.—Very near P. 
th, 
tin with the same habit and stipules, the stems more frequently 
ttened and the leaves generally very y. with : rominent eentral 
| one 
e 
Mss 26; P. compressus, F. Muell. F raga vin. 216, and of many 
Victoria. Murray River, F. Mueller. 
`. P. p ectinatus, Lin , Enum. iii. 137.—Stems very 
ile repeatedly dichotomous. T s all submer rged, very narrow- 
to 
ther long ceni isi cM scuriada is Que. edge and often projecting at 
top into 2 small scarious lobes, the sheathing stipules of the other 
Species Wanting or rarely sheathing the base of the peduncle. Peduncles 
cach d aring 
other, ben a slender interrupted spike, rarely reduced to a 
‘terminal cluster. Nutlets of P. Presb or rather smaller.— 
