76 GEOLOGICAL SURVEY OF CANADA. 



648. WOLFFIA, Horkel. (WOLFFIA) 



(2415.) W. Columbiana, Karsten. ; Gray, Man. Ed. V., 420. 



Abundant in mai'shes of the Bay of Qainte, near Belleville, Ont. 

 ■{Macoun.) In the marsh at the head of Burlington Bay, Hamilton, 

 Ont. (BucJian.) 



(2416.) W. Brasiliensis, Weddell.; Gray, Man. Ed. V., 480. 



Growing with the preceding and Lemna minor, in the " Big Marsh'' 

 one mile beyond " the Fei-ry," Prince Edward Co. ; near Belleville, on 

 the Bay of Quinte, Ont. (Macoun.) In the marsh at the head of Bur- 

 lington Bay, Hamilton, Ont. {Buchan.) 



Specimens of this genus are distinguished from any form of Lemna 

 by the absence of roots. Hitherto they have been rarely detected, but 

 it is less from their absence than from their small size. 



CXIY. ALISMACE.^. Water-Plantain Family. 



649. ALISMA, Linn. Gen. 460. (WATER-PLANTAIN) 



^2417.) A. Plantago, Linn., Yar. Americanum, Gray, Man. 

 Ed. T., 492. 



A. Plantago, Linn. ; Michx., PI. I., 218 ; Hook., Fl. II., 168. 

 A. natans, Pursh, Fl. I., 253 ; Hook., FI. II., 168- 

 A. irivialis, Pursh, Fl. I., 252. 



Eather common in ditches and borders of streams from the Atlantic 

 to the Pacific. It varies greatly in the form of its leaves, but the 

 varieties are not recognized. Windsor, Grand Lake, Halifax, Pictou, 

 and Truro, If.S. (Sommers, Cat.) Common in wet places, N. B. 

 (Fowler, Cat.) Abundant throughout Quebec and Ontario, and extend- 

 ing westward to British Columbia. On the prairie region' its leaves 

 •often become linear, and float on the surface of the still brooks south 

 of Battleford. 



We have doubtfully referred the A. natans, Pursh, to this species, as 

 from the meagre description it seems to belong here. It was gathered 

 in "stagnant waters of the St. Lawrence" by Pursh himself. 



