84 GEOLOGICAL SITRVEY OF CANADA. 



(2436.) p. amplifolius, Tuekerman, Amer. Journ. Sci. VI. (2, 

 Ser.) 226. 

 Not rare in deep and still water, hut seldom collected. In the mill 

 pond at Stirling ; and Elziver, Hastings Co. ; Gull Lake, Barrie, Adding- 

 ton Co. ; at the lower end of Big Bushkong Lake, Victoria Co., and 

 in the Potawatamie Eiver, above Jones Falls, Owen Sound, Ont. 

 (Macoun.) In water, Parry Sound, Georgian Bay. (Burgess.) King's 

 Mere and Meech's Lake, in the Chelsea Mountains, near Ottawa. 

 (Fletcher, Fl. Ott.) Missinaibi River and Lake, Ont. {R. Bell.) 

 Marshes, Burlington Bay, Hamilton, Ont. (Logie.) Niagara River, 

 on the Canadian side. {Tuekerman.) Near Victoria, Vancouver Island. 

 (Fletcher.) 



(2437.) P. gramineus, Linn. ; Gray, Mnn. Ed. V., 487. 



P. hterophyllw, Schreb. ; Hook., Fl. II., 172 ; Pursh, Fl. I., 120. 

 Common in streams from the Atlantic to the Pacific. In flowing 

 water at Coal Branch, Kent Co. ; Tobique River, and Salmon River, 

 N.B. {Fowler, Cat.) Lake Utopia, N.B. (Wetmore.) Little Tobique 

 Lake, N.B. (Hay.) Titusville, N.B. (Brittain.) Flowing water at 

 Truro, N.S. ; Salt Lake, Anticosti ; in a rapid stream between West- 

 wood and Peterboro, Ont; vicinity of Belleville, Hastings Co., Ont.; 

 River St. Clair, near Windsor, Ont. (Macoun.) Wabigoon River, west 

 of Lake Superior. ( Fletcher.) 



Var. (near) graminifolius, Fries. 



In shallow water. Lake Mistassini, N.E.T. {J. M. Macoun.) Ottawa 

 River. (Fletcher, Fl. Ott.) 



Var. maximus, Morong. 



Flowing water, Becscie River. Anticosti. {Macoun.) Not uncom- 

 mon at Ottawa. (Fletcher, II. Ott.) 



Var. heterophyllus, Fries. 



The common form and found throughout the country. Grand Val- 

 ine, Gasp4 coast, Q. {Macoun.). Abundant in the vicinity of Ottawa. 

 (Fletcher, Fl. Ott.) Nation River, Ont. (Billings.) Mud Lake, near 

 Kingston, Ont. (Millman.) Near Belleville, Hastings Co., and general 

 throughout central Ontario in rivers, lakes and ponds, and westward to 

 Lake Superior, where it is particularly abundant. " (Macoun.) Parry 

 Sound, Georgian Bay. (Burgess.) Lake Mistassini, N.E.T., and Mis- 

 sinaibi River, Ont. (J. M. Macoun.) Oba Lake, Ont. (R. Bell.) 

 Jones Falls, Ont. (Millman.) Abundant in fresh water ponds through- 

 out the prairie region, through the Rocky Mountains, and west" 



