POTAMOGETON. | NAIADACE. 315 
Stem terete, sparingly branched. Leaves usually 1-1} in. long, sessile, 
amplexicaul, ovate or ovate-lanceolate, cordate, obtuse, membranous 
translucent, 5-7-nerved on either side of the midrib; stipules small, 
caducous. Spikes dense at first becoming laxer, up to 1 in. long. 
Sepals +1; in. long including the distinct claw, limb elliptic-obovate. 
Drupelets } in. long, obliquely ovoid, scarcely keeled, with a distinct 
usually hooked beak. 
Throughout the area, common. Dehra Dun, Bundelkhand (Duthie), 
Flowers apparently all the yearround. Disrrip.: N. Hemisphere 
and Australia. 
4. P. crispus, Linn. Sp. Pl. (1753) 126; F. B. I, vi, 566; Prain, 
Beng. Pl. 1123 ; Cooke Fl. Bomb. ti, 838. 
Stems slender, compressed, branched. Leaves 1-24 by }-% in. linear or 
linear-oblong, crisped and finely serrulate, translucent, sessile, 
3-nerved ; stipules small caducous. Spikes up to } in. long, few- 
flowered, lax. Sepals =4, in. long including the claw, limb suborbi- 
cular. Drupelets 4 in. long, obliquely ovoid, tipped with a com- 
pressed curved beak. 
Throughout the area. Dehra Dun, Moradabad, Agra, Kheri. Flrs. 
March, April. Disrrrs.: Cosmopolitan except S. America. 
5. P. pectinatus, Linn. Sp. Pl. (1753) 127; F. B. I. vi, 567; 
Prain, Beng. Pl. 1123; Cooke Fl. Bomb. ii, 838. PP. pusillus, 
subsp. flabellatus, Hook. f. F. B. I. vi, 567. 
Stems filiform, usually much dichotomously branched. Leaves 1-4 by 
5 in. or much narrower usually 3-nerved with the lateral nerves 
close to the recurved margins; stipules sheathing with short free 
points, 2 in. long or less. Spikes about an inch long, flowers few in 
distant whorls. Sepals +, in. long, limb broadly obovate. Drupelets 
}-} in. long, oblique, broadly ovate or almost semicircular with a 
very short beak, scarcely keeled. 
Throughout the area. Saharanpur, Agra, Merwara. Firs. October, 
March (probably all the year round). Disrrrs.: as for P. crispus. 
P. filiformis, Pers. Synops. I (1805), 152; A. Bennett, Journ. Bot. 
XX XIII (1895), 372. 
Closely resembles P. pectinatus. Leaves filiform l-nerved. Drupelets 
y's in. long. 
Gwalior (Maries in Herb. Mus, Brit.) fide Bennett, 1. c. I have not 
geen this species from our area. 
