MOSELEY. 41 



P. FRiEsii, Rupr.* 



Sandusky Bay, Put-in-Bay ; infrequent. 



P. HETEROPHYLLUS, Schreb.* 



Frequent; especially the variety longipeduncula- 

 tus. The variety maximus occurs at North Bass. 



P. HiLLii, Morong.* 



East Harbor ; rare. 

 P. INTERRQPTUS, Kitaibcl.* 



Sandusky Bay, Put-in-Bay ; rare. 

 P. I.ONCHITES, Tuckerm. 



Common. 

 P. LUCENS, L.* 



Frequent. 



P. NATANS, L. 



Common, as is also the so called variety, pro/ixus. 



P. PECTINATUS, L. 



Abundant- 



P. PERFOLIATUS. L. 



Frequent. 

 P. PERFOLIATUS RiCHARDSONii A. Bennett. 



Abundant. ' 



P. PRAELONGUS, Wulf.* 



Sandusky Bay, August Guenther. Perhaps its 

 habit of withdrawing beneath the water, as 

 soon as its fruit is set, has prevented us from find- 

 ing much of it. 



P. PUSILLUS, L.* 



Infrequent. 

 P. ROBBiNSii, Oakes. 



Sandusky Bay ; scarce. 

 P. zizii. Roth.* 



Sandusky Bay ; scarce. 

 P zosTER^FOLius, Schum. 



Common. 



TRIQLOCHIN, L. Arrow-Grass. 

 T. PALUSTRE, L.* 



Castalia Sporting Club grounds ; rare. 



