Pofamogefon. tetRandria Tetragynia. 471 



2. M. tnherculafhniy R. 



I eaves verticilUd, pinnatifid. Fluzcers axillary, verlicilled, tetran- 

 drous; fiuit teUaceoiis, tuberculed. 



A naUve oi boideis of iu^es, and other moist places near Calcutta. 

 Is ill bloSouiu must pait ol' llie }fcar, and veiy much hke M. telraii' 

 di uin. 



iU'tns creeping, round, joiuled, length various, the erect extremi- 

 ties uljuut live or six inches. — Leaves verticilltd, pii.nalitid, or 

 acutely serrate. — Flozi'ers verticiiled, sessile, one in t!ie a\il ot' each 

 leaf, small, pink-coloured.— Ca/j/.i' none. — Corol ; petals oblong, tx- 

 pa ic.ing, pink-coloured. — Filameni short. Anthers liueur. — Se<:ds 

 united in the form of a four-!ubed, tubercled pericarp. 



rOTAMOGETON. Schreb. Gen. N. 234. 

 Calyx none. Carol four-petalled. Germs four. Stj/les none. Seeds 

 four. Embrijo hooked, without perisperm. 



1. P. indicnni, I\. 



Creeping. I ernes alternate, from narrow-lanceolate to ellipti- 

 cally oval, opaviue, glossy, many-nerved. Anthers four pair, attach- 

 ed to the claws of the round concave petals. 



A na;ive of the borders oi' fresh water lakes and ditches in the vi- 

 cinity of Calcutta. Flowers in February and March. 



Stems creeping. 'I'he sn;a 1 sun pie roots which issue from the 

 joints are all I can discover, (or while tl.e plunt advances from the 

 apex, it decavs at the o)>|)os!te end, so that 1 do not ihnik any part 

 of thtm exis s for one vtar. Branches few and like what I call the 

 stems ; they are ail round, smoolh and jointed at various distances. 

 leave'i alierna'e, except next to the flowers, and there often opposite, 

 petioled, from narrow lanceolate, to elliptically oval, opaque, even, 

 and very smooth, or rather flossy, eniiie, obtuse, obscurely many- 

 nerved ; size very various. Tho^e that remain immersed are narrow- 

 er, longer, more strongly marked with nerves, and subtransparent.— 

 Tdioles simple, not sheathing, length various, io plai>ts left by the 



