Potamogeton.) OXXXVIII. NAIADEA. 171 
dense and cylindrical, often 1 in. long or more, on a stout peduncle. 
Nuts ovoid, above 1 line long, slightly compressed, uud straight, with 
lor3 dorsal ribs, CS or acute, quite entire or more or gr dentieu- 
late or murieate.—R. Br. Prod. 943; Hook. f. FL Tasm. ii. 41; F. 
Muell. Fragm. i viii. any, Reichb. Ic. Fl. Germ. t. 50; P. het terophyllus, 
Hook. f. Fl. Tasm. ii. Al, and of some authors, but not the true plant o 
Schreber, 
N. S. Wales. "Port fedet, gi re pter in rivers and creeks, Woolls 
E vs others. 
Rivers and creeks in various parts of the colony, F. Mueller and 
many De 
Tasmania. Pondsand still rivers, abundant, but usually a small-leaved variety, 
J. D, Hooker and others 
tralia. 
S. Aus Murray and Tamunda Rivers, F. Mue 
Ww. Rants tralia, Pur: Murchison River, eter 
The "eei 1s one of the most common over the greater part of the area of the 
genus. The few specimens in which the e floating leaves are wanting are Wee 
confounded with varieties of F; riu dire but are readily distinguished b 
leaves more or ee petiolate and several-nerv: 
2. P, tenuicaulis, F. Muell. Fragm. i. 90, 244, viii. 217.— Perhaps 
à variety of P. natans, with which it is closely connected through 
the small Tasmanian variety of that species. Stems almost filiform. 
F aiig leaves oblong-elliptical or lanceolate, 3 to 1$ in. long, acute at 
the bas €w-nerved. Stipules very thin. " Submer ed leaves few, 
end ‘Spikes dense, 4 to 6 lines long. Nutlets smaller than in P. 
i area more distinctly rostrate and the ribs often but not always 
atic 
ulate. 
N. Australia. Gulf of Carpentaria, F. Mue 
a, 
,, Queensland, Bris B River. Bailey ; More diii Bay, Leichhardt ; Rockhamp- 
D, Bowman, 0’ Shanes y; jadis gham Bay, Dallachy ; Mont Elliot, Fitzalan. 
This is evidently the same as the Bengal plant which Indian botanists have re- 
ferred to the North h rth American 2 Abr idus, Mich. which it closely resembles in habit, 
^ and inflorescence, but the fruit is very different and the seed is n y 
Filed. It It ma y be, as suggested by F. Mueller, the same as P. jav Ra! anicus, Hassk. from 
fea andif s xd should bear that name, but the character given is insufficient for veri- 
n and we have no specimens for comparison, 
Drummon dii, Benth. — Floating leaves on long slender 
E tpn oblong 1 to 1i in. TE thin and many-nerved; 
Scare > With numerous small closely packed nutlets, each one 
cely 1 line ong, the dorsal rib and lateral angles very prominent, the 
"e Coto 80. Seed much curved forming usually a complete coil. 
i d. 
This differs fro st old-world and comes nearest to the N. American 
in its poo a arto Re pe edem but differs from that — = the 
n remarkably large and ulva-like, the floating leaves hinner 
longer and the seed not quite so spiral. 
