682 
Plants of the Punjab, 
WATER PLANTS. 
HERBS WITH ALTERNATE STIPULATE SIMPLE LBAVES. 
Potamogeton 
perfoliatus, 
NAIADACE. 
F. B. I. vi. 566. 
Himalaya, 
4-8,000 ft. 
(Collett). 
Baluchistan, 
(Stocks). 
Potamogeton 
erispus, 
NAIADACEZE. 
F. B. I. vi, 566. 
The Plains to 
1,000 ft. 
Kashmir (Collett). 
Khanki, 
Potamogeton lucens 
NAIADACES. 
Boa ayaa, (567, 
Kashmir, 
5-6,000 ft. 
(Collett). 
Potamogeton 
pectinatus, 
NAIADACES. 
F. B. I. vi. 567, 
The Plains to 
12,000 ft. 
(Collett), 
Khanki. 
Potamogeton 
pusillus, 
NaIADAOEB. 
F. B. I. vi. 567, 
Kashmir; 6,000 ft; 
PETALS NONE. 
like the last species, but all leaves submerged, stem 
stout, dividing into two, leaves 1-4 in., ovate, heart-shaped, 
stem clasping, margins even, upper leaves opposite, stipules 
small, soon falling off, flower spikes crowded, sepals long- 
stalked, drupelets ;4, m., hardly ribbed, flattened, beak 
short, straight. 
like the last species, but stem slender, flattened, leaves 
1-3 in., narrowed at the base, linear or upper opposite and 
half stem-clasping, tip rounded, margins very wavy, 
finely toothed, flower spikes few-flowered, very short, 
flowers very small, drupelets larger, 3 in., ovoid, flattened, 
long-beaked, ribs entire or toothed. 
like the last species, but stem stout, leaves large, 
4-10 in., nearly sessile, lanceolate, very slightly wavy: 
upper leaves sometimes floating, stipules large, long, 2- 
winged or keeled, flower spike stout, drupelets +5 in., 
stout, convex on both sides, shortly bluntly beaked, 
stem thread-like, densely branched on opposite sides, 
leaves 3-8 in. by 3)-3 in., very narrow, grass-like, base 
sheathing, margins slightly thickened, stipules like small 
lobes on the edge of the lobe sheath, flowers at intervals 
along the spike, drupelets 4 in., large, stout, smooth, hardly 
beaked ; for other characters see the first described species 
of this genus, 
like the last species, but leaves 4-8 in., narrowly linear 
or thread-like, stipules small, not united to the sheath, 
flowers few, minute, clustered, drupelets stoutly beaked, 
bluntly ribbed. 
