30 



P. pusillus. Koch Syn. ed. 2, p. 780. — Kunth Enum. III, p. 136 (excl. var. 6.). 

 — Gorter Fl. ingr. p. 26. — Kalm Fl. fennic. No. 101. — Falk Beitr. II, 

 p. 121. — Guldenst. lt. I, p. 76. 108. 189. — Gilib. Exerc. phylol. II, 

 p. 424 c. icone. — Stephan Fl. mosq. No. 112. — Georgi Beschreib. d. 

 Russ. R. III, 4. p. 747. — M. a Bieb. Fl. t. c. I, p. 117. — Mart. Fl. mosq. 

 p. 32. — Luck Fl. osil. p. 397. — HSfft Cat. Ilur.sk. p. 13. — Chamiss. et 

 Schlechtend. in Linnaea II, p. 170. — Ledeb. Fl. alt. I, p. 159. — C. A. 

 Meyer Ind. cauc. p. 11. — Eichw. Skiaxe p. 126. — Claus Ind. des. in 

 Gubel //. // , p. 314. — Weinm. Fl. petropol. p. 20. — Turcz. Cat. Baikal. 

 No. 1093. — Hohenack. Enum. Talusch. p. 12. — Fleisch. et Lindem. Fl. d. 

 Ostseeprov. p. 67. — Bongaru et Meyer Suppl. Fl. alt. No. 290. — Nylan- 

 der Spicil. pl. fennic. I, No. 24. — Nylander Paroec. Pojo. No. 353. — 

 Ruprecht in Beilr. a. Pflanz.enk. d. Iluss. R. IV, p. 43. 



P. marimuni. Pall. It. II, p. 393? 



P. foliis linearibus, oppositis alternisque, distantibus, basi patentibus, caule tereti. 

 Gmel. Fl. sib. III, p. 33, No. 22. 



a. major: foliis latioribus, lineam fere latis. 



P. Friesii. Rufrecht tn Beitr. %. Pflanzenk. d. Russ. R. IV, p. 43. 

 P. rutilus. Wolfg. in Schult. Mant. in Syst. Veg. III, p. 362. — Eichw. 

 Skiaae p. 126. 



/J. vulgaris- foliis dimidiam lineam circitcr latis. 



y. tenuissimis: foliis angustissimis, quandoque quartam v. quintam Iineae partem 

 vix latis. 



Hab. in Rossia [ubique (Falk)] s e pt en t rionali [Ostrobothnia (Nylander in 

 litt), Fennia (Kalm, Nylander)J, media [Petropoli (Gorter, Chamiss. et 

 Schlechtend., Weinm., Ruprecht), Esthonia (Fleisch. et Lincem.), ins. Osilia 

 (Luce), Livonia! et Curonia (Flkisch. et Lindem.), Lithuania ! (Gilib., Besser 

 et Wolfg. pl. exs., Eicuw.), Kursk (Hofft), Mosqua (Stephan, Mart.), Sim- 

 birsk et Saratow (Claus)] et australi [ad Tanain et alibi in terra Cosac- 

 corum (Guldknst.)], in provinciis caucasicis! (C. A. Meyer) [ad fl. 

 Terek (Gui-Denst.) pr. acidulam Nartzana! (Hofft pl. exs.) , in Mingrelia 

 (Nordmann) et provinc. Schirwan (Hohenack.)] inque Sibiria uralensi 

 (Falk) pr. Jekaterinenburg (J. G. Gmel.), in proviuc. Iset (Pall.), altaica! 

 (Falk, Fl. alt.) et baikalensi! (Turcz.). 4. 



19. P. trichoides (Chamiss. et Schlechtend. in Linnaea 11, p. 175 

 (excl. syn. Mart. et Koch Deulschl. Fl. 1, p. 857) foliis omnibus sub- 

 mersis membranaceis pellucirlis sessilibus setaceo-Iinearibus acumina- 

 tis uninerviis aveniis, perlunculis spica 4 — Sflora saepe interrupta 

 duplo triplove longioribus, fructibus semiorbiculatis, caule teretiusculo 

 ramosissimo. 



P. trichoides. Koch St/n. ed. 2, p. 780. — Rui>recht in Beitr. ». Pflansenk. d. 

 Russ. R. IV, p. 44. 



Hab. in Rossia media [Petropoli (Chamisso et Schlechtend., Ruprecht)]. 4. 



Sect. IV. Coleophylli. Koch Syn. ed, 2, p. 7S0. 



Tota planta submersa: spicis sub anthesi tantum emersis. Folia 

 graminea, exacte linearia, omnia conformia, alterna, basi vaginantia, 

 vagina stipulae adnata. 



20. P. pectinatus (L. Spec. 1S3) foliis omnibus submersis mera- 

 branaceis pellucidis basi vaginantibus linearibus v. Jineari-setaceis 

 acutis uninerviis transverse venosis : venis crassiusculis , spicis longe 

 pedunculatis, fructibus oblique obovatis subsemiorbicularibus compres- 

 sis, siccatis dorso carinatis. 



P. pertinatus. Kocn Syn. I. c. — Kalm Fl. fennic. No. 98. — S. G. Gmel. 

 It. IV, p. 63. — Lepech. //. ///, p. 134. — Georgi Beschreib. d. Russ. R. 



