Table 1. - Per cent of r-.se, per cent of abundance and index 

 rating of aquatic plants in four areas of the Illinois 2xvk.r Valley, 



IbvjO, 



Plant 



Per Cent 

 of Use 



Per Cent Index 

 of. Abundance li.ating 



Rice cut-,':rass ( Leersi a oryzo^des ) 2C.45 

 Coontail ( Cerato pliyll u-M dpue^rs;^:!^;:^) • ■ 22.72 

 Nut:3ra3ses ( C yperu s spp. ) 11.70 



Marsli srnartweed ( Polyponu.a I .u^-ler-bgrjjii ) S.61 

 Loneleaf '-'ondweed ( Potanofeton aji.iericanus ) 5.35 

 Buttonbusli ( Cephalantlius occidentalis ) 

 Teal grass ( Eragrostis hypnoides ) 

 V/ater herap ( Acn^da tuberculata ) 

 Sr.iar tweeds (Polyigonu'i spp. ) -;.--;- 



Duck potato ( Sag itta ria latif olia) 

 Sago pondweed ( Pota:"ior:eton pecti r iatu s ) 

 .li.ierican lotus ( rel^ai.ibo lutea) 

 Giant burreed ( Sparganiu^n eurycarpujg ) 

 River bulrush ( S cirp-gs f luvi ati lis ) 

 '..Lite waterlily ( C astalia tuberosa ) 

 Marsli cord [,i-ass ( S partina I'licliau.xiana ) 

 Gpike rushes ( Sleocliari s spp.) 

 Pickerelweed ( Pontederia cordata ) 

 Bushy pond'/eed ( I'a jas guadalupsn s i s ) 

 liud plantain ( He teranthera dub in ) 

 Other native foods (total of 50) 



3.49 

 5.16 

 2.17 

 1.55 

 1.40 

 0.39 



. 55 

 0.50 

 0.21 

 0.15 

 0.05 

 0.00 

 0.00 

 0.00 



0.40 vevj low 

 trace very lov/ 

 trace ver"-" low 



-;;-;. Other than jiuPxlenoergi: 



-;;-,;--;d,"o figure given because of difficulty of r.easurey.ient 



