314 Fluciales. 



3) Graralnifola. Folia omnia submcrsa, conforniia, 

 scssilia, gramineo - lincaria, strialo-3 — 5-nervia, mem- " 

 branacea, pellucida. Stipulae intcr se connatae, a folio 

 distinctae. 



8. Potamogeton zosterifolius Schumach. Saell. 50. Flor. 



Dan. t. 1865. Chamisso, Adnot. 7. Merf. et Koch. 



Germ. 1. 853. Reichenh. Ic. 2. f. 308. 



Caulc foliacco-complanato, ramoso; foliis omnibus 

 submersis, conformibus, sessilibus, lincari - gramincis, 

 mcmbranaceis, pcllucidis, raultinerviis, nervis 3 — 5 va- 

 lidioribus; stipulis intcr se counatis, a folio distinctis, 

 cfjlandulosis; «picis 4 — 15-floi-is, continuis, peduuculo 

 brevioribus. 



P. compressus Linn. Spec.\%3. Flor. Dan. t. 2,03. Engl. 

 Bot. t. 418. Koch.*) Synops. 676. (fonna foliis oblusis, 

 breviter mucronatis, spicis 10 — Ib-Jloris.) 



P. complanalus Willd.in Berl. Mag.lSOd.ldl. {forma 

 foliis acuminato-acutis , spicis plurijloris.) 



P. acutifolius Link in Roem. et Schull. Syst. 3. 513. 

 Mert.etKoch. Germ. 1 854. Heichenb. Jc. 2. /. 309. Koch. 

 Si/nops. 676. (^formafoliis cuspidatis , spicis 4 — 6-Jloris.) 



In fluviis, fossis profundis ct in lacubus pas- 

 sim. (In der Spree bei Bellevue, ira Grunewald, 

 im Tegelschen See.) Floret acstate. 2f 

 9. Potamogeton obtusifolius Mert.et Koch. Germ. 1. 

 855. Hujus Synops. 677. 



Caule compressiusculo-tereti, ramosissimo; foliis ora- 

 nlbus subraersis, conforraibus, sessilibus, lineari-grarai- 

 neis, obtusis, breviter raucronulalis, merabranaceis, 3-, 

 rarius 5-nerviis, pcllucidis; stipulis intcr se «onnalis, a 

 folio distinctis, utraque basi tuberculo {jlanduloso instruc- 

 ti$5 spicis 6— 8-floris, continuis, longitndinc pedunculi. 



P. compressura Rolh. Germ. 1. 73. 2. 205. inild. Prod. 



•) P. compressus Mirt. et Koch. Gerrn 1. 856. est P. pusilli var. ma- 

 jor, fide Koch. 



