Poiamogeton. 313 



P. lucens Web. Priinit. 15 



P. flexicaulis Dethard. in Strelitz. Anz. 1809. 



P, acuminatum Wahlcnb. Ups. n. 116. Flor. Dan. 1. 1384. 



P. flexuosum Bredow. Flor. MecJcl. 



In fluviis lacubusque rarius. (In dcr Havcl 

 und Sprec, im Teg-elscUen See, Grunewald.) Flo- 

 ret aestatc. 2[. 



6. Potamogeton perfoliatus Linn. Spec. 182. Flor. Dan. 



t. 196. Engl. Bot. t. 168. Ckamisso, Adnot. 7. 

 Mert. ef Koch. Germ. 1. 815. 



Caule snbraraoso, fereti; foliis omnibus snbmersis, 

 conformibus, sessilibus, basi cordala semiamplexicaulibus, 

 oratis vcl ovato-lanceolalis, obtusis, marjjine scabrius- 

 culis, membranaceis, pellucidis; slipulis inter se connatis, 

 a folio distiuctis, byalino-membranaceis, serius evanes- 

 centibus; pcdunculis aequiterctibus ; fructibus (reccntibus) 

 lateribus compressis, obtusanjjulis. 



In lacubus et fluviis frequens. (In der Sprec, 

 Havel, im Tcg^clschen und Grunewalder See.) 

 Floretaestate. 2J. 



7. Potaraogeton crispus Linn. Spec. 183. Flor. Dan. 



t.927. Engl. Bot. 1. 1012, Chamisso, Adnot.l. 

 Mert. et Koch. Germ. 1. 852. 



Caule rumoso, compressiusculo; foliis omnibns sub- 

 mersis, conformibus, sessilibus, oblongo-Iinearibus, ob- 

 tusis vel breviter acnminatis, argnte denticulatis, nnda- 

 lato-crispis, merabranaceis, pellucidis; stipulis inter se 

 connatis, a folio distinctis, byalino-membranaceis, serius 

 cvanescentibus; pedanculis aequitcrctibus: fructibus lateri- 

 bus comprcssiusculis, slylo persistcnte acuminalo-rostratis. 



In lacubus aquisquc s ta^]^ n an tibus atque 

 lcnte flucntibus. (Gruncwald, Charl o ttenburg, 

 Thiergartcn, Jun{jfernheide, Papenberg;e,Weis- 

 sensee.) Floret aestate. 2f 



n. 14 



