56 



ALISMACE^. 

 Alisma Plantago, L Water Plantain 



var. Americana, Gray. 



Margin of Niagara River above the Falls. 



Sagittaria variabilis, Engelmann Arrow-Head 



Above the Falls in wet places on the Canadian side. 



Sagittaria heterophylla, Pursh. 



Niagara River, near La Salle. Clinton. 



Triglochin palustre, L. 



Wet ground above Clifton, Ontario. Of unusual size. 



NAIADACE.F. 



Naias flexilis, Rostk Naiad 



Niagara River above the Falls. 



Zannichellia palustris, L Horned Pondweed 



Abundant in the upper portion of Niagara River and therefore to 

 be expected nearer the Falls. 



Potamogeton natans, L Pondweed 



Niagara River near Strawberry Island. Clinton. 



Potamogeton hybridus, Michx Pondweed 



Black Creek, Ontario, opposite Grand Island. 



Potamogeton rufescens, Schrader Pondweed 



Niagara River. Rev. Thomas Morong. 



Potamogeton fluitans. Roth. (P. lonchites, Tuckerman.) . Pond- 

 weed. 



Niagara River. Rev. Thomas Morong. 

 Potamogeton lucens, L Pondweed 



Niagara River. 



Potamogeton amplifolius, Tuckerman Pondweed 



Niagara River. Rev. Thomas Morong. 



Potamogeton gramineus, L Pondweed 



var. heterophyllus, Fries. 



Niagara River. 



var. elongatus, Morong. 



Niagara River. Rev. Thomas Morong. 



Potamogeton prselongus, Wulfen Pondweed 



Niagara. Provancher, Flore Ganadienne, p*. 027. 



Potamogeton perfoliatus, L Pondweed 



var. lanceolatus, Robbins. 

 Niagara River. Rev. Thomas Morong. 



