]() ki.()t:.\ of grand r.Ai'iDs. 



60. P. heteropliyllus graminifoUus (Fiies) Moroug. 

 Found with tlic s)>t'ci('s. Aug.-Sept. 



«il. p. Illinoensis Moronu,-. 



Muddy banks of Kouge l^ivor at Plainiicld Villatrc. Aug. 



02. P. lateralis Morong. 



Abundant in Heed's Lake along theN.W. shore from JNlanhattan 

 Beach to Lakeside CIul) House, growing in dee]) water (M. & C). 

 July. 



63. P. lonchites Tuckerm. (1*. iluitans lloth.) 



Lake borders and sIoav streams; not infrequent. July-Aug. 

 Abundant in Reed's Lake; Sacldle-Bag Swamp region; C4rand 

 River; Thornapple River. 



64. P. lucens L. 



Abundant in Reed's Lake. -iVug. 



65. P. natans L. 



In shallow or deep water in lakes, ponds, and slow streams; 

 common. July-Aug. 



66. P. pectinatus J^. 



Thornap[>le River; GrandRiver; Reed's Lake; abundant. July- 

 Aug. 



67. P. perfoliatus L. 



AV)undant in Reed's Lake and in Grand River. July-Aug. 



68. P. perfoliatus Richardsonii A. Bennett. 



(P. ])erfoliatus lanceolatus Robbins.) 

 Found growing in abundance with tiie species. July-Aug. 



6V». P. praelongus Wulf. 



Abundant in Reed's Lake, and in Little Bostwick Lake. 

 Aug.-Sej)t. 



70. P. pusillus L. 



Abundant in Reed's Lake along the N. W. shore from Manhattan 

 Beach to Lakeside Club House. Found growing with P. hiteralis. 

 Julv-Aug. 



