Plants of the Punjab. 



631 



Polygonum 

 Hydropiper, 



Polygonum 

 flaccidum, 



Polygonum 

 strigosum, 



WATER PLANTS. 

 Herbs with Alternate, Stipulate, Simple Leaves, 



Petals none. 

 see Herbs, Erect, Alternate, Stipulate, Simple, Entire. 



see Herbs, Erect, Alternate, Stipulate, Simple, Entire. 



see Herbs, Erect, Alternate, Stipulate, Simple, Entire. 



Polygonum 

 amphibium, 



P0LYG0NACE.E. 

 F. B. L V. 34. 



Kashmir. 



Polygonum 

 lanigerum, 



Potamogeton 

 indicus, 



Naiadace^. 

 F. B. L vi. 565. 

 The Plains to 

 5,000" ft. 



*medium size, perennial, partially submerged, rootstock 

 creepmg, wood}- ; leaves usually long-stalked and floating, 

 or nearly sessile and aerial, blunt, oblong or lanceolate, 

 stipules tubular, abrupt!}' ended, smooth or hairy ; flowers 

 I in. long, red, in spike-like slout raccmtrS, 1-2 in. long, 

 main stalk stout, bracts mor<j or less tubular, calyx 4-5 

 fid, ^- in., not nerved, much longer than the nut, petals 

 none, stamens 4-8, styles 2 ; ]iut ovoid, biconvex, shinhigv 



see Prostrate Herbs, Alternate, Stipulate, Simple. 



medium size, submerged, rootstock creeping, stem 

 cylindrical ; floating leaves 3-4^ by 1-2| in., oblong with a 

 rounded tip, leathery, lower submerged, leaves longer, 

 narrower, papery, stipules 1-1|- in., free ; flowers small in 

 spikes on a main stalk rising from a membranous sheath, 

 bractless, sepals 4, concave, green, anthers 4, sessile; 

 on the segments, carpels 4, sessile, : tigma nearly sessile^ 

 persistent ; drupelets small, smooth, seeds nearly kidney- 

 shaped. 



Potamogeton natans, like the last species, but leaves folded at the insertion 



Naiadace.^. of the stalk, submerged leaves, if any, long, narrow, sessile-; 



P. B, L vi. 565. main flower stalk stout, stipules 4-5 in., much longer, 



The Plains to drupelets larger, keeled at the back, shortly beaked. 



5,000 ft. 

 Kashmir. 



Potamogeton 

 javanicus, 



NAIADACE^ffi. 



F. B. L vi. 566. 

 The Plains to 

 7,000 ft. 

 Simla (Collelit). 



like the last species, but stem very slender, leaves 

 I'll in., ovate-oblong, pointed at both ends, stalk very 

 short, submerged leaves linear, long-tipped, stipules l-l 

 in., main flower stalk slender, flower spikes not crowded 

 with flowers, sepals round, drupelets ^ in. stout, ribj 

 toothed, beak stout, hooked, 



