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Plate 62] POTAMOGETON KAIAS 187
filiform, sharp-pointed, opaque, 1-3-nerved or the lower sometimes
5-nerved. Stipules united with the leaf-sheaths, the tips
free. Peduncle with the spike 2-3 in. long, filiform, usually
longer than the leaves, not thickened upwards. Flowers few,
in few distant whorls, very small, green. Sepals almost round.
-
Druplets in. long, swollen, slightly compressed, shortbeaked,
rounded and obscurely 3-keeled on the back.
Flowers. July.
Locality. Nil Nag, in lake, 6,900 ft.
Distribution. Plains of India, the Himalaya, W. and E.
Tibet, 12,000-17,000 ft., Ceylon, most regions.
Potamogeton pusillus,
Linn. Small Pondweed.
Stem slender, not usually flattened, cylindrical, muchbranched.
Leaves all submerged, half-stem-clasping, narrow,
linear, usually 3-veined (or 5-7), with no intermediate veins,
more or less sharp-pointed, the lateral veins half-way between
the midrib and margin. Stipules small and sharp-pointed.
Spikes short, loose, shorter than the stalk, with 6-10 flowers.
Sepals roundish to kidney-shaped. Druplets small, obliquely
egg-shaped, swollen, bluntly keeled, with a stout, more or less
terminal beak.
Locality. At about 5,000 ft.
Distribution. Upper Bengal, Patna, Punjab, Kashmir,
N. and S. temperate regions.
NAIAS, Linn.
(The Greek Naias, a water nymph.)
Fig. 3. Naias major, All.
A slender, submerged herb. Stems often long-branched and
interlacing, rough with short outgrowths. Leaves opposite
or in whorls, linear, i-lj in. long, deeply and sharply toothed,
sheathing at the base. Flowers very small, axillary, stalkless,
1 -sexual, the sexes on different plants. Male flowers : Perianth
tube-shaped, 2-3-toothed ;
anther 1, stalkless, included in the
perianth. Female flowers : No perianth ; ovary with 1 ovule.
Stigmas 3, thread-like. Fruit oblong, smooth.
Floivers. May to September.
Locality. Dal Lake.
Distribution. Throughout India, ascending to 8,000 ft.
in the W. Himalaya, Ceylon ;
almost cosmopolitan except
zones.
frigid