Aponogeton.] clxx. NAiADAOEiis. (J. D. Hooker.) 565 



saying, " There is a var. if not a distinct speuies with hedgehog 2.seeded capsules, 

 but in all other respects the same." — It follows that he, by inadvertence, describes 

 the follicles of A. echinatum as 6-seeded. 



4. A. micropliylluin, Boxb. Fl. Ind. ii.. 211 ; leaves very small 

 oblong long-petioled sides incurved, spike solitary, sepals much larger 

 than, the 3 smooth 1-2-seeded follicles, seeds globose. Spathium miorophyl- 

 lum, Voigt Sort. Suburb. Calcutt. 694 



Bhotan Mts. ; in damp places, Moxhurgh. 



I have seen no specimens, and Roxburgh's description differs much from a 

 drawing in his collection. The latter represents a plant seven inches high, with a 

 smooth naked tuber, four leaves with sheathing petioles \\ in. long, blade i by ^ in. 

 concave recurved, apparently oblong acute, and quite opaque ; spike 1^ in., clothed 

 with spreading white sepals J in. long, and red-brown anthers. Roxburgh, on the 

 other hand, describes the leaves as many times shorter than the spike, spreading 

 close to the surface of the earth, 1 in. long by 5 broad, and the spike as everywhere 

 covered with beautiful blue flowers. The globose seeds are remarkable. 



3. FOTAnXOaETOK, Unn. 



Submerged water-plauta with creeping rootstock. Leaves submerged 

 or floating, opposite or alternate, entire or toothed ; stipules intrafoliaoeous. 

 Flowers small, spicate on a scape rising from a membranous spathe, 

 ebracteate. Ferianth-segrrients 4, concave, green, valvate. Anthers 4, 

 sessile on the segments, didymous, slits extrorse. Carpels 4, sessile, 

 1-celled, 1-ovuled ; stigma subsessile or decurrent, persistent ; ovule in- 

 serted in the inner angle of the cell, campylotropous. Drupelets small, 

 coriaceous or spongy. Seed subreniform; embryo maoropodal. — Species 

 about 50, cosmopolitan. 



In determining the Indian species of Potamogeton I have had tlie invaluable 

 aid of Mr. Arthmr Bennett, F.L.S., whose knowledge of the genus is as full as it is 

 accurate. 



* Upper or all the leaves floating. 



1. P. indicus, Boxb. Fl. Ind. i. 452 ; upper leaves floating oblong 

 elliptic or elliptic-lanceolate coriaceous, lower submerged longer narrower 

 membranous, stipules 1-li in. free, spike dense-fld., drupelets small 

 smooth. Kuntk Fnum. iii. 139 ; Bon Prodr. 21 ; Wall. Cat. 5175 exel. F. ; 

 Grah. Oat. Bomb. PI 200; Dalz. & Gibs. Bomb. Fl. 248. P. Koxburghianus, 

 Schult.f. Mant. iii. 367. P. natans, Thw. Enum. 333. 



Throughout the plains of India, ascending the Himalaya to 9000 ft. in Sikkim . 

 BuBUA, Gollett. CEXLOif, Thviaites. — Disteib. Malay and Sandwich Islds. 



/Siem terete. Moating leaves Z-i!^hj\-2\ in., alternate or uppermost opposite, 

 base acute or rounded, opaque; stipules as long as the petioles or shorter. Pedntncle 

 stont or slender. — Differs from P. natans especially in the shorter stipules and 

 smaller drupelets. 



2. P. natans, Linn. Sp. PI. 126 ; upper leaves floating oblong 

 elliptic or elliptic-lanceolate biplicate at the insertion of the petiole, sub- 

 merged few or 0, stipules 4-5 in. free spikes dense-fld., peduncle stout, 

 drupelets dorsally keeled shortly beaked. Kunth Enum. iii. 127. Beichh. 

 Ic. Fl. Grerm.Yii. t. 60; Boiss. Fl. Orient, v. 15 ; Aitch. Oat. Punjab PI. 

 145. P. rufescens, Aitch. I. c. 145. 



