CATALOGUE OF CANADIAN PLANTS. St 



(Buchan.) Nortli shore of Lake Superior. (Agassiz.) Lake Mistassini, 

 N.B.T. (J. M. Macoun.) Port Carleton, Saskatchewan Eiver. (Macoun.) 

 Camberland House to York Factory, on Hudson Bay. {Hooker, Fl.) 



Var. Niagarensis, Gray. 



P. Niagarmsis, Tuckerman, Amer. Journ. Sci. (2, Ser.) VII., 354. 



Eapids above Niagara Palls. {Burgess.) Niagara Eiver, near the 

 brink of the Hog's Back, growing plentifully with Udora ; and else- 

 where in the river. (Tuckerman.) 



(2445.) P. pusillus, Linn. ; Gray, Man. Ed. Y., 488. 



Eather common in ditches and slow streams. In ditches at Halifax, 

 N.S. (Macoun.) Little Eocher, N.B. (Fowler, Cat.) Yicinity of 

 Ottawa. (Fletcher, Fl. Ott.) Common in streams inland, from Pres- 

 cott, Ont. (Billings.) Grand Yall^e, Gasp^ coast, Q. ; in flowing water 

 at Hull, Q. ; in the Eiver Trent, at Trenton, and abundant in still 

 waters and ditches throughout central Ontario. (Macoun.) Gockburn 

 Island, Georgian Bay. (J. Bell.) Jones Falls, Eideau Eiver. (Mill- 

 man.) Little Saskatchewan, near Eapid City, and not uncommon in 

 pools in the prairie region. (Macoun.) Lake of the "Woods. (Burgess.) 

 Lake Mistassini, N. E. T. (J. M. Macoun.) Specimens referred here 

 were collected at Port McLeod, B.C., lat. 55°. (Macoun.) 



Yar. vulgaris, Fries. ; Gray, Man. Ed. Y., 489. 



This is a longer and more branching form, with generally cylindri- 

 cal and interrupted spikes. Madeline Eiver, Gasp^, Q. ; Gull Eiver, 

 Yictoria Co. ; in deep water, Trent Eiver, Seymour, Northumberland 

 Co., Ont. ; Shawnigan Lake, Yancouver Island. (Macoun.) The Qom- 

 monest form at Ottawa. (Fletcher, Fl. Ott.) 



Yar. panormitanus, Biv. 



Eideau Canal, near Ottawa. (Fletcher, Fl. Ott.) 



Mr. Morong writes of this variety : " I have carefully compared 

 these (Mr. Fletcher's specimens) with the plant sent me as P. pusillus, 

 L., var. panormitanus, Biv., and can see no essential difference. In my 

 specimens the (submerged) leaves are shorter, thoy are not ruddy 

 at all, and none revolute. The description of the variety, however, 

 corresponds " leaves longer," (than the type) flaccid, the upper flower- 

 ing ones opposite and spatulate, the whole surface of the leaf with a 

 pretty chain-like areolation." I am sure that your plant meets this 

 description, and when compared as to the floating leaves the specimens 

 agree. I should not, however, regard it as a distinct species, since it 



