CATALOGUE OF CANADIAN PLANTS. 411 



Ottawa and Eideau rivers near Ottawa, also Nation Eiver at Oassel- 

 man, {Fletcher Fl. Ott.) Boucherville Island near Montreal, 1821. 

 {Holmes.) Moist ground north of the Junction Freight Shed, Prescott, 

 Ont. {Billings.) Shore of the Bay of Quinte at Zwick's Island, near 

 Belleville, swamp between Bridgewater and Tlinton, Hastings Co. ; 

 also at head of the marsh, Owen Sound Bay. {Macoun.) Vicinity of 

 York Factory, Hudson Bay. {R. Bell.) "Wet places around Hamilton. 

 {Buchan.) Point Abino, Lake Brie. {Judge Clinton.) 



(1885.) P. Persicaria, Linn. Lady's Thumb. 



Very common in waste places around dwellings and low rich culti- 

 vated soils. Extensively naturalized and spreading with settlements 

 to all parts of the country both in Manitoba and British Columbia. 



(1886.) P. Hydropiper, Linn. Smart-weed. 

 P. mite, Ell. Cat. Holmes Herb. 16. 



In ditches by roadsides, and on roads in woods eastward and 

 apparently introduced, but westward it is found on the margins of 

 lakes, ponds and rivers where settlement has never taken place. It is 

 easily distinguished from the next by its triangular, black and shining 

 achenium. 



(188Y.) P. acre, HBK. Water Smartweed. 

 P. hydropiperoides, Pursh. Fl. 1, 270. 

 Wet places, principally in small brooks in woods. Small brooks 

 near Ottawa. {Fletcher Fl. Ott.) Abundant along Conway's Creek 

 near Prescott. {Billings.) In a ditch a little north of the paper mill, 

 Belleville, also in a brook between Trenton and Belleville. {Macoun.) 

 Wet places around Hamilton. {Logic & Buchan.) In shallow water, 

 Parry Sound and Muskoka, Ont. {Burgess.) Vicinity of London. 

 {Saunders.) 



(1888.) P. hydropiperoides, Michx. Mild Water-pepper. 

 P. mite, Pers. Pursh, Fl. I., 270. 

 In flowing water or where it is constantly wot. Bloomfield, King's 

 Co., N.B. {Brittain.) Very common at Montreal, 1821. {Holmes.) 

 Common in ditches and brooks around Ottawa and at Casselman on 

 the Nation Eiver. {Fletcher Fl. Ott.) Marshy banks of the Nation 

 Eiver at the crossing of the St. Lawrence and Ottawa Eailway. 

 {Billings.) Common in ditches at Belleville, Ont. {Macoun.) Maiden 

 neai- Amhei-stburgh, Ont. {Mnclagan.) Vicinity of Hamilton, Ont. 

 {Buchan.) Shallow water at London. {Burgess.) Very abundant in 

 ditches at Port Colborne, Ont. {Macoun.) 

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