146 Potamaceae. 



Nauplia (Haussk.); j)!-. Metbone Messeniae, Annyros in Maina (Chaub.); 

 Cycladum insula: Delos, Melos (Chaub.); Creta: pr. Hierapetra (Raul.); 

 Cephalonia (Heldr.); Corcyra: pi. Potanio (Mazz.). — Maio, Sept. 2|_. 



4. Potamog-etoii L. gcn. n. 174. 



1. Sectio. Heterophylli Koch syn. p. 672. — Folia inferiora 

 submersa, pellucida, alterna, floralia natantia subopposita coriacea, dis- 

 similia; stipulae liberae. 



a. Folia submcrsa margine laevia. 

 a. Folia omnia longe petiolata. 



1. P. nataiis L. sp. p. 126; S. et S. pr. L p. 108; Ch. et B. 

 exp. p. 58, Fl. pelop. p. 12; Mazz. in ant. ion. IV. p. 954; Fraas fl. 

 class. p. 271; Raul. cret. p. 860; Bois. fl. or. V. p. 15; Form. in D. 

 bot. Mon. 1890 p. 6, in Ver. Briinn 1896 p. 22; Heldr. chlor. Mykou. 

 p. 251. — Icon: Fl. dan. t. 1025. — Exsicc. : Sint. et Bornm. it. 

 turc. n. 1493. 



Caule simplici vel ramoso; foliis longe petiolatis, submersis mem- 

 branaceis, pellucidis, lanceolatis oblongisve, acutis, integris, sub anthesi 

 destructis, ad petiolum reductis, natantibus coriaceis, ovatis oblongisve, 

 basi rotundatis subcordatisve; petiolis semiteretibus, supra planis; pedun- 

 culis caulem crassitie aequantibus; spica cylindrica, densa; fructibus 

 ovatis, breviter rostratis, margine obtuse-carinatis. 



^. fluitaiis Roth tent. I. p. 72; Mazz. in ant. ion. IV. p. 954; 

 Bois. fl. or. V. p. 16; Haussk. symb. p. 23; pro sp ; Cham. adnot. 

 p. 4. — Icon: Fl. dan. t. 2105. — Foliis submersis sub anthesi ])er- 

 sistentibus, natantibus oblongo-lanceolatis, basi attenuatis; j^etiolis sub- 

 triquetris, supra convexis; })edunculis caule crassioribus ; fructibus mar- 

 gine acutiuscule-carinatis. — Exsicc: Heldr. it. thessal. IV. a. 1885. 



In aquis stagnantibus et fluentibus. Thessalia: pr. Kalabaka, 

 Trikala (Form.), in fl. Potoki pr. Megala Kalyvia (Heldr.), ad lacum 

 Nezeros (Form.), pr. Litochori (Sint.); Attica: in fl. Cej^hissus (Fraas); 

 Messenia: in fl. Pamisus pr. Methone et Andrussa (Chaub.); Cycladum 

 insula: Delos, Tenos (Heldr.), Antimilos (Reis.); Creta: in fl. Khidiso 

 pr. Canea (Raul.); Corcyra: pr. Potamo, Stavropotamo, Chrysida, Cal- 

 cuma (Mazz.). — Maio, Aug. 2[. 



^. Folia submersa sessilia, natantia petiolata. 



2. P. alpiiius Balb. misc. p. 13. — P. annnlatus Bell. in mem. 

 acad. Turin VIl. p. 445; Mazz. in ant. ion. IV. p. .956. — P. rufes- 

 cens Schrad. in Cham. adnot. p. 5; Bois. fl. or. V. p. 16. — Icon: 

 Rchb. germ. t. 32. 



Canle simplici vel ramoso; foliis submersis sessilibus, membrana- 

 ceis, pellucidis, lanceolatis, acutis vel obtusis, integris, basi attenuatis, 

 sub anthesi persistentibus, natantibus coriaceis, oblongis, in i^etiolum 

 attenuatis, interdum deficientibus ; pedunculis caule subcrassioribus; spica 



