74 GEOLOGICAL SUEVET OF CANADA. 



the base of hills where springs abound. Abundant near the light- 

 house, Cape Forteau, Yarmouth, N.S. (Macoun & Burgess.) Lake 

 Utopia, Milkish, King's Co. ; Nigadoo Eiver, Gloucester Co. ; near the 

 Episcopal Church, Hammond Eiver, N.B. (Fowler, Gat.) Common 

 at Quebec. {Thomas.) Vicinity of Montreal, 1821. (X>r. Solmes.) 

 In a swam'p near Perth, Lanark Co., Ont. (S. B. Whyte.) In a deep 

 dell two miles north of "Warkworth, Northumberland Co., Ont. ; abun- 

 dant around St. Thomas, and Port Stanley, Ont. ; very common on 

 Michipicotin Island, Lake SuperlSr. {Macoun.) Oaklands, near Hamil- 

 ton, Ont. {Logie.) Low grounds, London, Ont. (Burgess, Millman.) 

 Vicinity of Toronto. (Burgess.) 



646. ACORUS, Linn. (SWEETiFLAG) 



(2411.) A. Calamus, Linn. ; Hook., Fl. II., 167; Pursh, PI. L, 235. 

 Abundant in marshes by rivers and lakes. Pennant Harbor, Hali- 

 fax Co., N.S. (Sommers.) Abundant in a marsh at Truro and near 

 Yarmouth, N.S. (Macoun.) Common on the borders of lakes and 

 ponds, Kouchibouguac, Kennebeccasis, and Hopewell, N.B. (Fowler, 

 Gat.) Shallow lake, Praserville, Q. (Thomas.) Sandy banks of the 

 Eiver Eouge, Argenteuil Co., Q. (D' Urban.) Abundant in marshes 

 aro and Ottawa. (Fletcher, FL Ott.) Margin of St. Lawrence Eiver, 

 and small streams near Prescott, Ont. (Billings.) Common in marshes 

 of the Bay of Quinte. and on the shores of Lake Ontario and all still 

 waters inland, north of the lake. (Macoun.) Vicinity of Hamilton, 

 (Buchan.) Chatham, Ont. (McGill Ooll. Serb.) Swamps at Kingston, 

 Ont. (Burgess, Millman.) Point Pelee marshes. Lake Brie. (Burgess.) 

 Sydenham Eiver, Owen Sound, Ont. (Macoun.) Oba Eivei*, Ont. 

 (B. Bell.) Lake of the "Woods. (Dawson, Burgess.) Canada to the 

 Saskatchewan. (Hooker, Fl.) 



CXIII. LBMNAOB^. Duckweed Family. 



647. LEMNA, Linn. (DUCKWEED) 



(2412.) L. trisuica, Linn. ; Hook., Fl. II., 169; Pursh, Fl. I., 22. 



Abundant in many ponds from the Atlantic to the Pacific. Ponds 

 Windsor, N.S. (Macoun.) Petitcodiac, N.B. (Fowler, Gat.) Abun- 

 dant around Ottawa. (Fletcher, Fl. Ott.) Conway's Creek and other 

 places near Prescott Ont. ; common. (Billings.) Very abundant in 



