In ditches, marshes, and the borders of ponds; common westward Marshes at Truro, and Annapolis, N.S.; and at Whycocomagh, Cape Breton. (Macoun.) Not uncommon in Carleton Co., and along the St. John River, KB. (Vroom.) Campbellton, N.B. (Chalmers.) Becscie River, and Ellis Bay, Anticosti. (Macoun.) Vicinity of Ottawa. (Fletcher,
Fl. Ott.) Swamps; common at Prescott, Ont. (Billings.) Borders of ponds, marshes, and swamps, throughout central Ontario, westward to Owen Sound, north-westerly to Lake Nipigon, and south to the Kaministiqua River, fifteen miles from its mouth. (Macoun) Vicinity of Hamilton, Ont. (Logie.) Port Colborne, Ont. (McGill Coll. Herb.) Swampy river bank, London, Ont. (Burgess. Millman.) Sault Ste. Marie. (R. Bell.) North shore of Lake Superior. (Agassiz.) Lake Mistassini, N.E.T.; Black River, Lake Winnipeg; Souris Plain, Man. (J. M. Macoun.) Lake of the Woods; Red River prairie, Man. (Dawson.) Abundant in marshes throughout Manitoba, and westward to the Peace River, lat. 56°; rather common in ponds in the foot-hille around Morley, and westward through the Rocky Mountains to Donald in the Columbia Valley; common in northern British Columbia on the Nachacco; along Shawnigan Lake, and the Alberni Canal, Vancouver Island. (Macoun.) Frequent on the banks of streams, from Canada to Bear Lake, and from Hudson Bay to the Pacific ocean. (Hooker, Fl.) Vancouver city, B.C. (Prof. Fowler.)
(2724.) P. Canariensis, Linn. Sp. I., 54.
Spontaneous on waste heaps around towns and villages. Pictou, N.S. (McKay.) Spreading from ballast at St. John, N.B. (Fowler, Cat.) Quebec city. (St. Cyr.) Around Ottawa. (Fletcher, Fl. Ott.) Waste places, near Prescott, Ont. (Billings.) Waste heaps at Belleville, Ont. (Macoun.) Lake shore at Kingston, Ont. (Millman.) Vicinity of Hamilton, Ont. (Logie.) Waste places, London, Ont. (Burgess.) On ballast at Nanaimo, Vancouver Island. (Macoun.)