CATALOGUE OF CANADIAN PLANTS. 39 



(119.) N. lacustre, Gray. Eiver-cress. 



N. natans. Hook. Fl. I., 39. 



N. natans, var. Americanum, Gray. Torr. & Gray Fl. I., 75. 



{?) Cochlearia aquaUca, Eaton, Manual, 181. 



In water near Montreal, ((roldie.) Vicinity of Ottawa. (FletrJier, 

 Fl. Ott.) Near Prcscott, Ont. (ProvanrJw.) Grand Eiver and Maiden, 

 Ont. {Madagan.) Eanisay, Ont. (J.Bell.) Very abundant in the still 

 waters of the Trent between Heely's Falls and Hastings village, and in 

 great profusion in the Trent at Meyersburg above the bridge over the 

 Percy Creek, Ont. ; also at Port Dover on Lake Brie. (Macouii.) 



(120.) N. Armoracia, Fries. Horse Eadish. 



Armorada rusticana, Rupp. Wood., Bot. & Fl., 41. 

 Introduced. Wastes near gai-dens, Quebec. (Brunei.) Not uncom- 

 mon near London. Ont. (Buryess.) Waste places where rubbish is 

 deposited in and around Belleville, Ont. ; Canada Southern Eailway near 

 Amherstburgh, Ont., and at Niagara Falls. (Macoun.) Vicinity of 

 Ottawa. (Fletcher Fl. Ott.) 



41. DENTARIA, Linn. (PEPPER-ROOT.) 



(121.) D. diphylla, Michx. Krinkle Eoot. 



Pictou, N.S. (McKay.) Kent Co., and near Fredericton, N.B. 

 (Fowler's Cat.) ^athurst, N.B. . (McGill Coll. Herb.) Eiviere du 

 Loup, Q. (Thomas.) Throughout (Quebec and Ontario to Lake Superior. 



(122.) D. laciniata, Muhl. Purxjle-flowered Tooth-wort. 



Low grounds of the river St. Francis, Q., rare. (Brunei.) Beechwood, 

 near Ottawa. (Fletcher Fl. Ott.) Common in rich woods near 

 London, Ont. (Burgess.) Mountain west of Hamilton, Ont. (Logic.) 

 Pentanguishene, Ont. (Richardson.) Chippewa, Navy Island, and 

 Maiden, Ont. Maclagan. Amoliasburgh, P. F. County, Out., and 

 near Amherstburgh, Lake Erie. (Macoun.) 



(123.) D. tenella, Pursh. 439. 

 D. tenuifolia, Hook. Fl. I., 40. 

 Northward to Vancouver Island and Lower Fraser Eiver, B. C. 

 (Lyall.) In low rich ground, vicinity of Victoria, Vancouver Island. 

 (Macoun^) 



Doubtful Specie.s. 



C. heterophylla is reported from Hamilton by Mr. Buchan, Prin- 

 cipal of Trinity College, Toronto, and D. maxima, fi-om Gait, by 



