.36 



NEW YORK STATE MUSEUM 



NAIAD AC EAE 

 POT AMOG ETON 



Leaves of two kinds, submerged and floating 1 



Leaves all submerged 4 



1 Submerged leaves filiform, bladeless 2 



1 Submerged leaves not bladeless 3 



2 Floating leaves an inch broad or more natans 



2 Floating leaves less than an inch broad Oakesianus 



3 Submerged leaves linear, sessile, two ranked Nuttallii 



3 Submerged leaves liuear-laneeolate, tapering to a sessile base alpinus 



3 Submerged leaves broad, petiolate amplifolius 



4 Leaves ovate or lanceolate, less than 3 in. loug perfoliatus 



3 Leaves elongated, more than 3 in. long praeloDgus 



Potamogeton natans Z. 



Floating pondweed 

 Shallow water. South end of Lake Placid. 



Potamogeton Oakesianus Robbins 

 Oakes's pondweed 

 Shallow water. Mirror lake. Fruiting specimens not seen. 



Potamogeton Nuttallii C. fir 8 S. 



P. Pennsylvanicus Cham. 



Nuttall's pondweed 



A common species in some parts of the Adirondacks but rare in North 

 Elba. Lake Placid. 



Potamogeton alpinus Bablris 

 P. rufescens Schrad. 

 Northern pondweed 



South end of Cascade lake. July. This and the next species just 

 come within the town limits at this place. They were collected here 

 many years ago, but have not been noticed elsewhere. 



Potamogeton amplifolius Tuckm. 

 Large leaved pondweed 

 South end of Cascade lake. July. 



