10 



Table 5. - Per cent of use, per dent of abundance and Index rat- 

 ing of dquatic plants at ruck Island, 1938. 



Plant 



Codntall ( Ceratophyllum d erne r sum ) 



Lorlgleaf pondweed ( Pota mo'geto n ainericanus) 14.14 



Marsh smar tweed ( Pol^-goraiiii I .Iul^len - ergii) 



Duck potato ( Sag it t ar la lat lfol ia) 



Rice cut-grass (Le ersia cry z o ides ) 



Giant burreed ( Sparganiura euryca rx^u m) 



Marsh cord grass ( Spartina Micliauxiana ) 



American lotus ( Helumbo lutea ) 



5m.ar tweeds ( Polygonum spp'. ) -:;--:;- 



Buttonbush ( C'eph alanthus b cciden t all's ) 



River bulrush ( Scirpus f luviatilis ) 



Sago pondv/eed' ( Po tamogetoh pectinat us ) 



V.'hite waterlily ( Castalia tube rosa) 



Other native foods (total' of 39) 



Hone recorded for the area 



Other than Miol - 1 e nb e r g i i 



No figure given because of difiiculty of Tieasureiient 



