174 CXXXVIII. NAIADER. [Potamogeton 
Reichb. Ie. Fl. Germ. t. 19; P. marinus, Linn. ; F. Muell. Fragm. vil. 
217; Reichb. Ic. Fl. Germ. t. 18. 
Victoria. YarraandGillibrand Rivers and Lake Colac, F. Mueller. 
Tasmania. Derwent River, Abbott. 
S. Australia. Holdfast Bay, St. Vincent's Gulf, F. Mueller. 
Very generally distributed over the area of the genus, in fresh and brackish 
waters. 
Tarsz II. ZosrEREx.—Flowers hermaphrodite or  unisexual. 
Perianth none or rudimentary or in one sex only. rpels 1 to 3 d 
rarely more, l-seeded or rarely several.seeded. Aquatic submerge 
e. 
plants, mostly marine or subsalin 
9. RUPPIA, Linn. 
Flowers hermaphrodite, in a spike enclosed when young in s 
sheathing bases of the floral leaves. Perianth none.  Anthers 2, ee 
with 2 distinct cells (described sometimes as four 1-celled anthers), th 
branched stems and linear-filiform leaves. 
5 d 
The genus is limited to a single species, common in salt and brackish go i 5 
marshes in most temperate or subtropical regions of the globe, varying o scm 
more or less slender foliage, in the beak of the fruit, etc., and divided by 
bolas 4 
nists into several species. 
K tima, Linn. ; Kunth, Enum. iii. 123.—Stems and peu 
submerged, filiform, the leaves often very long, the barren ones aite 
o 
anthers fall away, and the stalks of the carpels lengthen out to iud 
3 in. to aboye 1 in. Ripe earpels about 1 line long or rather pe 
Hook. f. Fl. Tasm. ii. 42; F. Muell. Fragm. viii. 217; Nees, ve 
.Fl. Germ.; Reichb. Te. Fl. Germ. t. 17. 
eensland. Moreton Bay, F. Mueller. 
diee Portland Bay and other points along the coast, also Lake Calvert 
where it is eaten by cattle, F. Mueller. 
Tasmania. Ab t in the Tamar, Derwent, etc., J. D. Hooker. 
Australia. Holdfast Bay, F. Mueller, hison 
ww. ia, Drummond, n. 180, 182, 183, mixed with Lepilena ; Mure 
River, Oldfield, en j 
