CATALOGUE OP CANADIAN PLANTS. 409 



Var. minus, Meisn. 



Arctic America. (Franklin vide Watson.) 



(1876.) P. imbricatum, Nutt. 



On dry gravelly places where water stands in the spring. Abundant 

 east of the Hand Hills, and on the Cypress Hills near the eastern 

 end. (Macoun.) 



(187Y.) P. articulatum, Willd. 



In sandy, barren fields, Canada. (Pursh.) Bather common on 

 sand at Point Aux Pins, eight miles above the Sault Ste. Marie. 

 (Macoun.) About the Saskatchewan. (Drummond & Richardson.) 

 North Shore of Lake Superior. (Agassi?.) 



(18*78.) P. nodosum, Persoon. 



Shore of Gull Island, Lake Nipigon, Ont. ; also growing on mud at 

 the mouth of Beaver Creek, Columbia Yalley, B.C. (Macoun.) Eupert 

 House, James Bay ; and shore of Muskeg Island, Lake Winnipeg. 

 (J. M. Macoun.) On alluvial soil at Port Moody, B.C. (Hill.) 



(1879.) P. incarnatum, Ell. 



P. nodosum, var. incarnatum, Gray, Man., 372, 1856. 

 P. lapathifolium, Cat. Holmes Herb., 16. 



Wet borders of streams, especially on alluvium. Local but abun- 

 dant when found. Strait of Canso, Guysboro' Co., N.S. (Sail.) At 

 Keswick and Moncton, N.B. (Fowler's Cat.) Abundant about the 

 suburbs of Montreal, 1821. (Holmes.) Waste places common at Pres- 

 cott. (Billings.) Abundant at Hull and other places around Ottawa. 

 (Fletcher Fl. Ott.) Very common along the Bay of Quinte and on flats 

 along the Eiver Moira at Belleville, also common in cultivated fields, 

 Seymour West, Northumberland Co., Ont., and along the shores of 

 islands in Lake Nipigon. (Macoun.) Vicinity of Hamilton. (Logie 

 & Buchan.) Not uncommon, along the borders of creeks, at London. 

 (Saunders & Burgess.} 



(1880.) P. Pennsylvanicum, Linn. 



Moist soil ; usually in ditches or depressions in pastures. Windsor, 

 N.S. (How.) Vicinity of Shediac, N.B. (Fowler's Cat.) Moist 

 soil at Beauport, near Quebec, (St. Cyr.) Mouth of Eiver St. 

 Pierre and other places near Montreal, 1821. (Holmes.) Very 

 common at Ottawa in low rich soil, and at Casselman on the Canada 

 Atlantic, forty miles from Ottawa. (Fletcher Fl. Ott.) Common 



