TETRANDRIA. TETn.vc. '|9 



211. P. crisptis. L. RS. 21. P. 7. W. 7. 



"^. 6 — 8. IJbique fere in fossis et fluvils. Folia 



omnia submcrsa, diaphana, lineari-lanccolata, mar^ina 

 seiTulato, undulato; pedunculi gequalcs; fructus ros- 

 tratus. 



212. P. ZOSteracfolillS. Sclmmacher. RS. 25. P. \\, 



If.. 7,8. In fossis, piscinis profundis, solo ar^il- 

 laceo : Coesfeld hinter dem Brink ! Darup am Hiweler 

 Feldel Nienberge!; in aquis fluentibus numquam cura 

 repcrimus. — Folia omnia submersa, longa, exacte 

 linearia , obtusa, fere 2 lineas lata; caulis ramosissi- 

 mus, comprcsso-alatus, superne praecipue latitudinc 



et colore foliorum ; pedunculi crassiusculi , 10 12- 



llori. 



213. P. ohtlislfolllis. Mertens et Knch. 



^. 6 — 8. In piscinis ct fossis profundls , solo tur- 

 foso-arcno.so rarior: Bentheim! E/^e! atque procul du- 

 l)io aliis locis vicinis. — Praccedenti maijnitudine et 

 liabitu valde simiiis, dilTert vero: foliis apice rottmdatis* 

 caulc compresso, lateribus rotundatis, ncc alatis; pc- 

 dunculis brcvioribus , 6 — 8 floris ; fructibus carinatis. 



214. P. compressus. L. RS. 24. P. 9. W. 9. 



^. 7,8. In fossis, praecipuc argillosis, passlm frc- 

 quens. — Magnitudinc intcrmcdius intcr procceden- 

 tem ct scqucntem. Foiia omnia submersa, linearia, 

 5nervia; peduncidi spica intcrrupta triplo longiorcs; 

 caulis comprcssus, non alatus. 



215. P. pusillus. L. RS. 34. P. 13. W. 14. 



/2. tCnuissimUS. Merlens et Koih. 

 ^. f) — 8. In fossis ct piscinis: frrqiirns prope 

 J)aruf)\ Coesfdd Ui der Jlarler Schitle ! alihiquo; /2 



4 



