NEBRASKA WILD-DUCK FOODS. 



51 



Dominant: 

 52. Star duckweed {Lemna trisulca) 



FLOATING PLANTS. 



Secondwry species: 



Small duckweed (Lemna minor). 

 Big duckweed {Spirodela polyrhiza) . 



Wild-duck foods. — Plants in the above list which have considerable value as 

 food for wild ducks are: Nos. 21, 24 (33), 32, 34, 39, 41, 43, 46, 52, 53, and 54; 

 those of less importance are: Nos. 1, 2, 5, 6 (25), 7, 11, 20, 23, 26 (36), 27, 29, 

 37, 42, 44, 45, 47, 49, and 50 ; the remainder are of no known value. 



WATTS LAKE, CHERRY COUNTY. 



August 29, 1915. 



Description. — Large marsh at west end of lake, which it is not safe to pene- 

 trate on account of the soft mucky bottom. Lake proper is mostly open water ; 

 depth 5 to 6 feet ; bottom largely muck. No inlet or outlet. 



DiSTEIBUTION OF VEGETATION. 

 SHOKE PLANTS. 



Grasses, sedges, etc., as for Dewey and Hackberry Lakes. In addition the 

 following : 



1, Sensitive lern (Onoclea sensiiilis) .* 



Common on mucky shore ; in fruit. 



2. Water smartweed (Polygonum amphi- 



Mum).* Not abundant ; flowers. 



3. Whorled loosestrife (Lysimachia quadri- 

 folia).* Sparse. 



MAKSH PLANTS. 



Dominants: 



4. Reed (Phragmites commutiia). 



5. Big bulrush (Scirpus occidentalis) . 

 Secondary species: 



6. Bur reed (Sparganium eurycarpum.) 



7. Cat-tail (Typha latifolia) . 



8. Wapato (Sagittaria latifolia).* Com- 



mon. 



9. Wild rice (Zizama palustris). Abun- 

 dant. A rice field in middle of marsh 

 comprises about one-flfth of entire 

 area. 



10. Spike rush (Eleocharis acuminata). 



11. Sedge (Carex utriculata) . 



12. Rush (Juncus dudleyi) . Sparse. 



13. Willows along marsh bank (Saliai). 



SEMISTJBMERGED PLANTS. 



Com- 



Dominants: 



14. Big bulrush (Scirpus occidentalis). 



15. Spike rush (Eleocharis acuminata). 



16. Wapato (Sagittaria latifolia). Com- 



mon. 



17. Wild rice (Zizania palustris). Sparse; 



shows effect of high water. 



Other smaller sedges and rushes listed amoug marsh plants occur also in 

 shallow water. , 



SUBMEEGED PLANTS. 



18. Reed (Phragmites com/munis). 



mon. 



19. Water smartweed (Polygonum ampht- 



Mum). 



20. Water hemlock (Cicuta maculata). 



Sparse. 



Dominant: 



21. Eelgrass pondweed (Potamogeton com- 



presaus). 



Secondary species: 



22. Water moss (Drepanocladus sp.) Com- 



mon. 



23. Sago pondweed (Potamogeton pecti- 



natus). Abundant. 



24. Small pondweed (Potamogeton pusil- 



lus). Common. 



25. Curly pondweed (Potamogeton per- 



foUatus richardsonii) . Common. 



26. Illinois pondweed (Potamogeton illi- 



noenais). Common, 



27. Long-leaved pondweed (Potamogeton 



am ericanus ) . Common. 



28. Bushy pondweed (Najas flexilis) . Com- 



mon. 



29. Water smartweed (Polygonum amphi- 



hium). 



30. Coon tail (Ceratophyllum demersum). 



Common. 



31. Spatterdock (Nymphaea advena) . Com- 



mon. 



32. Water milfoil (Myriophyllum spicatum) . 



Abundant. 



33. An alga (Nostoc verrucosum). Abun- 



dant, 



