GEOLOGICAL SURVEY OF CANADA. 



teuilCo., Q. (& Urban.) Abundant around Ottawa. (Fletcher, FL Ott.) 

 Railroad Bay, near Fresco tt, Ont. (Billings.) Yery 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 River, fifteen miles from its mouth, and in Lake Hannah, 

 Nipigon River. (Macoun.} Lake Missinaibi, Ont. (E. Bell.} Lake of 

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

 prairie region and northward to Lake Athabasca ; not uncommon in 

 Lost Lake, Shawn igan Lake, Home Lake and Sproat Lake, Vancouver 

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

 Sitka. (Rothr. Alask.) Stagnant waters, Canada to Hudson 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, Robbins, 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. Sci. XLV., 38. 



Not uncommon but seldom collected. Hampton, Salmon River, 

 and Norton, N.B. ; rather common. (Fowler, Cat.) In flowing water 

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

 River, 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. Vaseyir^obbins, Gray, Man. Ed. V., 485. 



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

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

 River, Victoria Co., Ont. (Macoun.) Rideau Canal, Ottawa. Form 

 with floating leaves and fruit. (Fletcher, Fl. Ott.) In 1865 this 

 species was sent toj3ir 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 



