82 GEOLOGICAL SURVET OF CANADA. 



teuil Co., Q. (I)' Urban.) Abundant around Ottawa. {Fletcher, Fl. Ott.) 

 Eailroad Bay, near Prescott, Ont. (Billings.) Tery common in nearly 

 all still waters throughout central Ontario. (Macoun.) Burlington 

 Bay, near the beach, Hamilton, Ont. (Logie.) In still water at 

 Kingston, Ont. {Millman.) Marshes at Point Edward, Lake Huron- 

 (J". M. Macoun.) Still waters, Owen Sound, Ont., and in the Kaminis- 

 tiqua Eiver, fifteen miles from its mouth, and in Lake Hannah, 

 Nipigon Eiver. {Macoun.) Lake Missinaibi, Ont. {B. Bell.) Lake of 

 the Woods. {Dawson.) Not uncommon in ponds throughout the 

 prairie region and northward to Lake Athabasca ; not uncommon in 

 Lost Lake, Shawnigan Lake, Home Lake and Sproat Lake, Yancouver 

 Island. {Macoun.) Near Victoria, Vancouver Island. {Fletcher.) 

 Sitka. {Rothr. Alask.) Stagnant waters, Canada to Hudsop Bay. 

 {Hooker, Fl.) 



Var. prolixus, Koch.; Gray, Man. Ed. V., 485. 

 P. natans, var /3. (?) Hook., Fl. II., 171. 



Collected in flowing water near Ottawa. {McGill Coll. Herb.) A 

 form approaching this variety was sent from London, Ont., by Burgess 

 {Macoun.) North West America. {Hooker, Fl.) Specimens should 

 be gathered of all forms. 



(2429.) P. Oakesianus, Bobbins, Gray, Man. Ed. V., 485. 



Apparently a rare species in Canada. In marshes at Ellis Bay, 

 Anticosti, 1883. {Macoun.) 



(2430.) P. Claytonii, Tuckerman, Amer. Journ. Soi. XLV., 38. 



Not uncommon but seldom collected. Hampton, Salmon Eiver, 

 and Noi'ton, N.B. ; rather common. {Fowler, Gat.) In flowing water 

 at Hull, Q. ; abundant in streams, North Hastings ; common in Gull 

 Eiver, between Gull Lake and Minden, Victoria Co. ; in Gull Lake, 

 Barrie, Addington Co. ; also in the river connecting Lake Isaac and 

 Sky Lake, Bruce Co., Ont. {Macoun.) Vicinity of Ottawa. {Fletcher, 

 Fl. Ott.) Blackstone Lake, Muskoka, Ont. {Burgess.) 



(2431.) P. Vaseyi, Eobbins, Gray, Man. Ed. V., 485. 



Apparently rare in Canada. Crow Eiver, above the dam at the 

 Iron Works, Marmora, July 19th, 1864 ; Big Mud Turtle Lake, Gull 

 Eiver, Victoria Co., Ont. {Macoun.) Eideau Canal, Ottawa. Form 

 with floating leaves and fruit. {Fletclier, Fl. Ott.) In 1865 this 

 species was sent to Sir William Hooker as P. diversifolius, Barton, 

 and believed by him to be that species, but later investigation showed 

 that Barton's species went with P. hybridus. About the same time 



