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, Cat.) Common 

 at Quebec. {Thomas.) Vicinity of Montreal, 1821. {Dr. Holmes.) 

 In a swamp near Perth, Lanark Co., Ont. (JR. B. Wliyte.) 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 Superior. {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., M. II., 167; Pursh, Fl. I., 235. 

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

 fax Co., N.S. {Sommers.) Abundant in a marsh at Trm'o and near 

 Yarmouth, jST.S. {Macoun.) Common on the borders of lakes and 

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

 Cat.) Shallow lake, Fraserville, Q. {Thomas.) Sandy banks of the 

 Eiver Eouge, Argenteuil Co., Q. {JD' Urban.) Abundant in marshes 

 around Ottawa. {Fletcher, Fl. Ott.) Margin of St. Lawrence Eiver, 

 and small streams neai' 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 Coll. Herb.) Swamps at Kingston, 

 Ont. {Burgess, Millman.) Point Pelee marshes. Lake Erie. {Burgess.) 

 Sydenham Eiver, Owen Sound, Ont. {Macoun.) Oba Eiver, Ont. 

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

 Saskatchewan. (Hooker, Fl.) 



CXIII. LEMNACEiE. Duckweed Family. 



647. LEMNA, Linn. (DUCKWEED) 



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



Abundant in many ponds from the Atlantic to the Pacific. Pond& 

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

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

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



