OATALOGTJE OF CANADIAN PLANTS. 63 



"We have no authentic specimens of this species except from the 

 shores of Lake Erie, at Pelee Point, arfti from Essex Centre, on the 

 Canada Southern Eailway, 1882. (Macoun.) 



(2383.) J. npdosus, var. a. genuinus, Engelm., Mon. June, 471. 



/. nodosus, Linn; Gray, Man. Ed. II., 482 ; Maooun, Cat. No. 1898. 

 J. polycephalm, var. /?. tenuifoUus, Hook., Fl. II., 190. 

 /. Bostkomi, La Harpe, Mon. June, 133. 

 J. echmatus, Muhl. Eioh., App. p. 11. 



Quite common in many localities, ranging from the Atlantic to the 

 Pacific. Wet sandy bottom, at Whycooomagh, Cape Breton. (Macoun.) 

 Eestigouche, Campbellton, Andover, Salmon Eiver, Green Eiver and 

 Upper St. John, N. B. {Fowler, Cat.} Salt Lake, Anticosti, and at 

 Pox Eiver, G-asp^ coast. (Macoun.) St. Charles Eiver, Q. (St. Cyr.} 

 Ticinity of Ottawa. (Fletcher, Fl. Ott.) Common at Prescott, Ont. 

 (Billings.) Border of Salmon Eiver, near Shannonville, Hastings Co., 

 Ont. ; in small brooks, Victoria Co., and at Owen Sound, Ont. (Macoun.') 

 Vicinity of Hamilton, Ont. (Buchan.) Wet river flat, London, and 

 at Southampton, Ont. (Burgess.) La Cloche Island, Georgian Bay. 

 (E. Bell.) North shore of Lake Superior. (Agassiz.) Shores of 

 •Thunder Bay, Lake Superioi', and on the shore of Lake Nipigon, at 

 Humboldt Bay. (Macoun.) Elk Island, Lake Winnipeg. (J. M. Macoun.) 

 Eather common in the bed of the Saskatchewan and its branches ; not 

 detected in the Eocky Mountains, and only sparingly at Donald, in the 

 Columbia Valley. (Macoun.) Along the Thompson Eiver, at Spence's 

 Bridge, B.C. (Fletcher.) Canada to Bear Lake. (Hooker, Fl.) 



The tall form mentioned by Dr. Gray (Manual 542) as occurring on 

 the islands above Niagara Falls, has been gathered at Point aux Pins, 

 Lake Erie, by Dr. Burgess. 



Var. megacephalus, Torr., Bot. JST. York II., 326. 

 J. megacephalus. Wood, Bot., 724. 

 Low rich soil or lake margins. Toronto Island, Lake Ontario. 

 (Burgess. Macoun.) Burlington Marsh, near Hamilton, Ont. (Buchan.) 

 Abundant in many places in low wet situations throughout Manitoba, 

 extending west to the Pile Hills and Elbow of the South Saskatchewan. 

 (Macoun.) Point aux Pins, Lake Erie. (Burgess.) 



(2384.) J. Canadensis, J. Gay, var. a, coarctatus, Engelm., 

 Mon. June, 473. 



/. Canadensis, /3, J. Gay, La Harpe Mon., 134. 

 /. accuminatus, Torr. Bot., N. York, II., 327. 

 J. aeutiflorm, ft minor. Hook., Fl! II., 190. (?) 

 Low grounds, especially along lake margins ; not uncommon. Bed- 



