86 GEOLOGICAL SURVEF OF CANADA. 



Weller's Bay, Lake Ontario. (Macoun.) Kemptville, Ont. (Porter.) 

 Kingston, Ont. (Millman.) Canada to Slave Eiver. {Sooker, FL) 



Var. lanceolatus, Eobbins, Gray, Man. Ed. V., 488. 



This seems to be the western and northern form, as it is abundant 

 westward where the species seems to be absent. St. Clair Flats, Ont. 

 (J. M. Macoun.) Abundant at Ottawa, in all waters. {Fletcher, FL 

 Ott.) Lakeof the Woods. {Burgess.) In the still waters of the lake 

 expansions of Nipigon Eiver, and in the mouths of rivers north of 

 Lake Superior. {Macoun.) Lake Mistassini, N.B.T. ; and Missinaibi 

 Eiver, Ont. {J. M. Macoun.) James Bay, at Moose Factory. {Cottar & 

 Dr. Hayden.) Nelson Eiver, Keewatin. {B. Bell.) Moose Mountain 

 Creek, Man. {J. M. Macoun.) Long Lake, noi-th of Eegina, Assini- 

 boia ; in a small pond on Copper Mountain, Eocky Mountains. {Macoun.) 

 Lewes Eiver, lat. 62°. {Dawson.) 



(2442.) P. zosterifolius, Schum.; Hook., Fl.IL, 172. 



P. compressus, Fries. ; Gray, Man. Ed. V., 488 ; Macoun, Cat. No. 1732. 

 Eather common in still water. Still and slow flowing water, St. John, 

 N.B. (FowZer, Cat) Vicinity of Ottawa; common. {Fletcher, Fl. Ott.) 

 JSTear Montreal, 1821. {Dr. Holmes.) St. Lawrence Eiver and slow 

 streams] common at Prescott, Ont. {Billings.) Jones Falls, Eideau 

 Eiver, Ont. {Millman.) London, Ont. {Burgess.) Abundant in the 

 Bay of Quinte, and in all the rivers in central Ontario ; Gull Eiver, 

 Peterboro Co., Ont., and in Lake Hannah, Nipigon Eiver, Lake 

 Superior. {Macoun.) Oba Lake and river, and Missinaibi Eiver, Ont. 

 {H. Bell.) Burlington Marsh, Hamilton, Ont. {Buchan.) York Fac- 

 tory, Hudson Bay, and from Cumberland House, on the Saskatchewan, 

 to Portage La Loche, lat. 57°. {Hooker, Fl.) 



(2443.) P. obtusifolius, Mertens & Koch. 



A few specimens were gathered in mud on the margin of a small 

 lakelet near Point Fame Lighthouse, Gasp^ coast, Q., in August, 1882. 

 {Macoun.) 



(2444.) P. pauciflorus, Pursh, Fl. L, 121. 

 P. gramineum, Michx., Fl. I., 102. 

 P. pusHlum, Hook., Fl. II., 172. 



Not uncommon in still water. Eestigouche Eiver, N.B. ; rather 

 doubtful. (Fowler, Cat.) Madeline Eiver, Gasp^, Q. ; abundant in the 

 Bay of Quinte, and in the Trent Eiver at Trenton ; also Gull Eiver, 

 Peterboro Co., Ont. (Macoun.) Smith's Falls, Ont. {Prof. Fowler.) 

 Billings Bridge, Ottawa. (Fletcher, Fl. Ott.) Marsh at Hamilton, Ont. 



