Potamogeton. TETRANDRIA TETRAGYNIA. 7 47i 
2: Mi ubareiilatund; R. 
“J eaves verticilled, pinnatifid. Flowers axillary, verticilled, tetrane: 
drous fruit tetraceous, tuberculed. 
JA native of borders of lakes, and other moist gii near Calcutta, 
Is in blossom most part of the pen, and very much like M. tetrar 
drum. 
Stems creeping, round, jointed, length various, the erect xti. 
lies about five or six inches.—Leaces verticilled, pinnatifid, or 
ucutely serrate,— Flowers verticilled, sessile, one in the axil of each. 
leaf, small, pink-coloured._-Calyx none 7 Corol ; petals oblong, X=. 
pancingy pink-coloured.—-Filament short, Anthers linear. oe 
united i in the form | of a four-lobed, tubercled pericarp, 
Hi» 
POTAMOGETON. Schreb. Gens N, 934. Io 
Calyx none. Corol four-petalled. Germs four. Sind none. Sed) 
four, Embryo — Filhas sereno 
i. P. indicum, R. H mcm £5 ; 
‘Creeping. -Leaves alternate, ia es enolate to ellipti« 
cally oval, opaque, glossy, many-nerved... Anthers four pair,’ ittmolie * 
ed: to the claws of the round concave petals. = 
LA naive of the borders of fresh water lakes.and ekoki in hé a 
Cinity of Calcutta. Flowers in February and March. 9. > 
Stems. creeping, Fhe small simple roots which issue from the 
joints are all ] can discover, for while the plant advances. from the 
apex, it decays at tlie opposite end, so that E do not think any part 
of them exists for one year. Branches few and like what I call the 
stems ; they are all round, smooth and jointed at various distances.— 
Leaves alternate, except next to the flowers, and there often opposite, 
petioled, from narrow- lanceolate, to elliptically oval, opaque, even, 
and very smooth, or rather glossy, entire, obtuse, obscurely manys 
nervedi size very various. Those that remain immersed are narrows 
er, longer, more strongly marked with nerves, and subtransparent.+a 
Petioles simple, not sheathing, length various, in plants left by the 
