The Flora of the Cayuga Lake Basin 49 



5. P. angustifolius Berch. & Presl. (P. Zizii of Cayuga Fl.) 

 Slow streams and the smaller lakes; scarce. Fr. Aug.-Sept. 



Spencer Lake; Summit Marsh (D.\) ; bayou near mouth of Fall Creek (D.) ; 

 Union Springs; Phillips Pond; pond n. w. of Lowery Ponds (D. in C. U. Herb.) ; 

 Duck Lake. 



Que. and Mass. to Calif., southw. to Fla., Tex., and Wyo. ; rare or absent on the 

 Atlantic Coastal Plain. Found also in W. I., Eurasia, and Africa. 



6. P. lucens L. 



Shallow water ; infrequent. Fr. Aug.-Sept. 



"West side of Cayuga L. and near Cayuga Bridge and Seneca River" {D. !) ; 

 s. end of Cayuga Lake (D. in C. U. Herb.). 



N. S. to Calif., southw. to Fla. and Mex. ; rare or absent on the Atlantic Coastal 

 Plain. Found also in W. I., Eurasia, and Africa. 



This species is difficult to distinguish from P. angustifolius. In both species the 

 leaves are apiculate. Fruiting specimens of P. lucens may be recognized by the 

 absence of floating leaves and by the 1-keeled fruits. The vegetative parts of this 

 species are coarser and more pellucid than in P. angustifolius. 



7. P. alpinus Balbis. (P. rufescens of Cayuga Fl.) 



Doubtfully reported by Dudley from Summit Marsh, Myers Point, and pool two 

 miles north, but not seen in recent years. Occurs near by in Cortland Co. 



Lab. to Alaska, southw. to Mass., n. N. J., Mich., Minn., Utah, and Calif.; rare 

 on the Atlantic Coastal Plain. Found also in Greenland and Eurasia. 



8. P. praelongus Wulf. 



Shallow or rather deep lake waters ; infrequent. Fr. Aug.-Sept. 

 S. w. part of Cayuga Lake (Z>.) ; occasional at foot of Cayuga Lake (D.). 

 Newf. to B. C, southw. to Conn., N. J., Great Lakes, Iowa, Mont., and Calif.; 

 rare or absent on the Atlantic Coastal Plain. 



9. P. Richardsonii (Benn.) Rydb. (P. perfoliatus and var. lanccolatus of Cayuga 



Fl.) 



Shallow and deep waters of lakes and pools ; frequent. Fr. July-Sept. 



Ithaca fair grounds ; Renwick ; Myers Point ; Union Springs ; Canoga and Cayuga 

 Marshes; Cayuga; Cayuga outlet (D.). 



Que. to Mackenzie and B. C, southw. to N. E., N. Y., Great Lakes, and Nebr. 

 (?) ; probably absent on the Atlantic Coastal Plain. 



P. perfoliatus L., included in Dudley's catalog, is far northern in distribution. 



10. P. bupleuroides Fernald. 



In shallow lake waters, usually on sandy bottoms ; scarce. Fr. July-Sept. 



Renwick (R. Hitchcock) ; Myers Point (D. in C. U. Herb.) ; n. of Canoga 

 Marshes; n. of railway bridge, Cayuga (C. C. Thomas); Duck Lake (A. J. E., 

 K. M. W., & L. F. Randolph). 



Newf. and e. Que. to Fla., rarely inland to w. N. Y. and Mich. ; mostly in 

 brackish situations. 



11. P. crispus L. 



Waters of large lakes and their adjacent marshes; frequent or common. Fr. 

 June-July, but rarely fruiting. 



Not found back from the Cayuga Lake Valley and its outlet system ; perhaps 

 confined to the lake because of salt requirements. This is the earliest species to fruit. 



Mass. to Out. and Va., in fresh or brackish marshes. Naturalized from Eu. 



