25 



tis strictis rigidis, stipulis convolutis cylindraceis; majoribus acutius- 

 culis pedunculis internodio longioribus subaequalibus incrassatis ter- 

 minalibus, spicis crassis, floribus densis. 



Hab. in Rossia media [Lithuania in fl. Niemen circa Szczorse (Jos. Jundzil 

 ex Schult.)]. 4- 

 „E majoribus". (Besser l. c.) — An a P. rufe scente vere 

 distinctus ? 



7. P. sparganifolius (Laested. ined.) foliis submersis sessilibus 

 merabranaceis linearibus Jongissimis; supremis lineari-lanceolatis acu- 

 minatis in petiolum attenuatis; natantibus longe petiolatis subcorianeis 

 oblongo-Ianceolatis, pedunculo aequali, fructibus recentibus lenticulari- 

 compressis margine acuto instructis, caule simplicissimo. 



P. sparganifoiius. Fries Novit. Fl. suec. Mant. I, p. 9. — Ej. Sumtna Veget. 



Scandinav. I, p. 213. 

 P. fluitans. Liljebl. Fl. suec. ed. 2. 

 Hab. in Rossia arctica [Lappoiiia tornens. fluv. (Fries in litt.)]. 4. 



Nnnquam rufescit, sed etiam exsiccatus laete viret. Folia ima 

 plures pedes passim longa ; natantia interdum deficiunt, tamen ne- 

 cessaria ; his emim privatus semper sterilis est. (Fries I. c.) 



8. P. rufescens (Besser in Chamiss. adnot. ad Kunth Fl. berol. 

 p. 5) foliis submersis sessilibus membranaceis pellucidis oblongis v. 

 lineari-oblongis basi apiceque attenuatis obtusiusculis margine laevibus; 

 natantibus coriaceis obovatis obtusis in petiolum folio breviorem atte- 

 nuatis, pedunculis aequalibus, fructibus recentibus lenticulari-compres- 

 sis margine acuto instructis, caule simplici. 



P. rufescens. Koch Syn. ed. 2, p. 777. - Chamiss. et Schlechtend. in Linnaea 

 II, p. 210. — Ledeb. Fl. alt. I, p. 157. — Eichw. Skizae p. 125. - Weinm. 

 • Fl. yetropol. p. 19. — Tlrcz. Cat. Baikal. No. 1089. — Flkisch. et Lindem. 

 Fl. d. Ostseeprov. p. 65. — Karel. et Kiril. Enum. pl. Fl. alt. No. 832. — 

 Eor. Enum. pl. des. soongoro-kirghisici No. 784. — Nylander Spicil. pl. 

 fennic. I, No. 20. — NyLANDER Paroec. Pojo. No. 351. 



P. semipellucitlum. Koch et Ziz. Cat. pl. palat. p. 5. 18. 



P. obscurum. Dec. Fl. franc. Suppl. p. 311. 



P. serratum. Roth Tant. Fl. germ. I, p. 73: //. p. 205. 



P. fluitans. Smith brit. III. p. 1391. 



P. annulatum. Bellardi i« Act. taur. VII, p. 445, t. 1, f. 2. 



P. alpinum. Bei.b. Misc. p. 13. — Timcz. Cat. Baikal. No. 1090. - Ej. pl. exs. 

 a. 1S33 (cum forma angustifolia). 



P. obtusus. Ducros 8p. Gaud. Fl. helv. I, p. 468. 



P. microstacbys. Wolfgang in Schult. Mant. in Syst. Veg. III, p. 360 (forma 

 angustifolia). 



P. longo serrato folio. Erndt. Virid. tcarsatv. p. 96. 



Hab. in Rossia septentrionali [Ostrobothnia et Fennia (Nvlander)] et 

 media [Petropoli! (Weinm. , Kuhlewein pl. exs.) , Estbonia , Livonia! et 

 Curonia (Flelsch. et Linden.), Litbuania! (Eichw. , Wolfgang pl. exs.); 

 Warsawia (Erndt.)], in Sibiria uralensi ad fl. Jaik infer. (Chamiss. et 

 Sciilechtenu.) , altaica! (Fl. alt., Karel. et Kiril.) in deserto soongoro- 

 kirghisico ad fl. Lepsa (Karel. et Kiril.). baikalensi! (Turcz.) et orien- 

 tali pr. Kirensk! rKRiinsE pl. exs.) inque D a vu r ia (Turcz.) et insula 

 Unalaschka! (Chamisso et Eschscholtz). 4. 



9. P. gramineus (L. Spec. 1S4) foliis subraersis raembranaceis 

 pellucidis oblongo-Iinearibus oblongisve acuminatis , basin versus atte- 

 nuatis sessilibus margine scabriusculis; supremis brevioribus Jatioribus 



