88 GEOLOGICAL SUKVET OF CANADA. 



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

 Kingston. Ont. (Millman.) Canada to Slave Kiver. {Hooker, Fl.) 



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



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

 westwai-d where the species seems to be absent. St. Clair Flats, Ont. 

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

 Ott.) Lake of the Woods. (Buriiess.) In the still watei-s of the lake 

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

 Lake Superior. (Macoun.) Lake Mistassini, N.E.T. ; and Missinaibi 

 River, Ont. (J. M. Macoun.) James Bay, at Moose Factory. (Cottar & 

 Dr. Hayden.) Nelson Eiver. Keewatin. (E. Bell.) Moose Mountain 

 Creek, Man. (J. M. Macoun.) Long Lake, north of I^gina, Assini- 

 boia ; in a small pond on Copper Mountain, Rocky MountaJbs. (Macoun.) 

 Lewes River, lat. 62°. (Daicson.) 



(2442.) P. zosterifolius, Schum.; Hook., Fl. IL, 1T2. 



P. comprei<si(.i, Fries. . i<ray, Man. Ed. V., 48S ; Macoun, Cat. No. 1732. 

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

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

 Near Montreal. 1821. (Dr. Holmes.) St. Lawrence River and slow 

 streams; common at Pres'cott, Ont. (Billings.) Jones Falls, Rideau 

 River, Out. (Millman.) London, Ont. (Burgess.) Abundant in the 

 Bay of (j uinte, and in all the rivers in central Ontario; Gull River, 

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

 Superior. (MacrAin.) Oba Lake and river, and Missinaibi River, Ont. 

 (B.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. obtusifoiius, Mertens & Koch. 



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

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

 (Macoun.) 



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

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

 P. pimUum, Hook., Fi. II., 172. 



Not uncommon in still water. Restigouche River, N.B. ; rather 

 doubtful. (FoU'ler, Cat.) Madeline River, Gasp6, y. ; abundant in the 

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

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

 Billings Bridge, Ottawa. (Ftetcher, FL Ott.) Marsh at Hamilton, Ont. 



