Biological Survey — Erie-Xiagara Watershed 195 



the most abundant forms. Potamogeton gramineus, P. americanus 

 and P. angustifolius frequently occurred in local areas, principally 

 in the lower part of the river. Najas ftexilis was common in shal- 

 low water, especially in the upper part of the river. Elodea cana- 

 densis appeared locally in protected beds in the river and about 

 boat landings at Youngstown. In a number of places where the 

 weed beds were very luxuriant, the water surface was covered 

 with a dense blanket-like mat of algae, mostly Cladophora sp. 

 which made it almost impossible to row a boat through it. On the 

 shallow bottom between the shoreline and the inner margin of the 

 weed beds. Chara sp. formed a low scattered growth, especially in 

 small bays made by bends of the river. Cladophora glomerata 

 was frequently very common on rocks along the shore. 



A List of Aquatic Plants Observed in Niagara River and the 

 Eastern End of Lake Erie 



Equisetaceae 



Equisetum limosum L. Horsetail. 



In shallow water near the mouth of Spicer creek, Grand island. 



Typhaceae 



Typha angustifolia L. Narrow-leaved Cat-tail. 



Frequent in marshy ground and shallow water along shores and 

 islands of Niagara river ; Dunkirk harbor. 

 Typha latifolia L. Common Cat-tail. 



Very local. Near the mouth of Spicer creek, Grand island; on 

 Canadian shore of Niagara river betw^een Peace bridge and Inter- 

 national bridge ; Dunkirk. 



Spabgaxiaceae 



Sparganium eurocarpum Engelm. Giant Bur-reed. 



Shallow water about Strawberry island and Grand island. 



Najadaceae 



Potamogeton amplifolius Tuckerm. Broad-leaved Pondweed. 



Local. In a bay near Grand island landing; north of Buckhorn 

 island. 



Potamogeton americanus C. & S. var. novaeboracensis (Morong) 

 Benn. 



Frequent. Niagara river; Buffalo harbor; Dunkirk harbor. 

 Potamogeton angustifolius Birch, and Presl. 



Frequent in deep swift water in the Niagara river. 

 Potamogeton bupleuroides Fernald. 



In shallow water. Buffalo harbor; Dunkirk harbor; Grand 

 island. 

 Potamogeton compressus L. 



Frequent. Niagara river; Dunkirk harbor. 



