

I 



II 



III 



IV| V 



VI 



VII 



VIII 



Potamogeton epihydrus Eaf. 



m 







5 











Potamogeton M'iesii Rupr. 



m 





4 







4 









Potamogeton foliosiis Eaf. 



m 



3 



3 















Potamogeton neterophyllus Schreb. 



n 







5 













Potamogeton natans L. 



m 



4 





3 





•± 







3 



Potamogeton peetinatus L. 



m 



3 



3 



3 



o 



6 



o 

 o 









Potamogeton preelongus Wulf. 



m 



4 



3 







4 







4 



Potamogeton pusillus L. 



m 





4 







4' 









Potamogeton Richardsonii (Benn.) 





















m 



3 



3 





Q 



o 



Q 



o 







3 



Potamogeton zosterifoliiis Sclium. 



m 



3 



3 



3 





3 









Zanichellia palustris L. 



m 





4 







4 







4 



"Mnicia flovilia /Willr) ^ T? St ^ 

 xNdJdS neXlllS (^VVlilQ.^ tX. OO O. 



m 



3 



3 



3 



A 



4 



o 

 o 







3 



Family Alismacece 





















Sagittaria arifolia Nutt. 



n 







3 









4 



3 



oagittana latiioiia wiiia. 



n 







o 





9 



4 





3 



EcMnodorus cordifolius (L.) Gr. 



n 







4 













Alisma plantago-aquatica L. 



n 







3 







3 



3 



3 



Family KydrocliaritacecB 





















Elodea canadensis Michx. 



m 



2 



2 







3 







3 



Elodea iowensis Wylie 



m 











Q 

 O 









Vallisneria spiralis L. 



m 



3 



2 





o 

 o 



9 







3 



Family Gramiyiew 





















Panicmn dichtotomum villosum 





















Vasey 



n 













4 







Panicum Gattingeri Nash. 



n 







4 







4 







Echinochloa crus-galli (L.) Beauv, 



n 







4 





4 





4 





Leersia oryzoides (L.) Sw. 



n 







4 





A 



4: 









Phalaris arundinacea L. 



n 







4 







4 







Alopecurus genicnlatns L. 



n 







4 



A 



4 







4 





Agrostis alba L. 



n 







4 









4 





CalamagTostis canadensis (Michx.) 



















Beauv. 



n 







2 





3 





3 





Sphenopholis pallens (Spreng.) 





















Scrib. 



n 







5 













Spartina Michauxiana Hitch. 



n 







3 



3 





3 





3 



Beckmannia erucasformis (L.) 





















Host. 



n 







5 













Phragmites communis Trin. 



n 







3 





4 









Poa triflora Gilib. 



n 







3 













Glyceria nervata (Willd.) Trin. 



n 







3 













Glyceria grandis Wats. 



n 







3 





4 









Elymus robustus Scrib. & J. G. S. 



n 







4 













Family Cyperacece 





















Cyperus aristatus Rottb. 



n 







4 





3 







3 



Cyperus erythrorhizos Muhl. 



n 







4 













44 



