NEBRASKA WILD-DUCK FOODS. 



73 



SEMISUBMEBGED PLANTS. 



Dominant: 



20. Tule {Scirpus validus). 

 Secondary species: 



21. Cat-tail (Typha latifolia). 



22. Bur reed (Sparganium eurycarpum). 



23. Wapato (Sagittaria latifolia). 



24. Reed (Phragmites communis). 



25. Cord-grass (Spartina gracilis) . 



26. Three-square (Hcirpus americanus) . 



27. Spike rush (Eleocharis, probably 



glaucescens) . 



28. Water smartweed (Polygonum amphi- 



Miim). 



29. Water hemlock {Cicuta mMCulata). 



SUBMERGED PLANTS. 



Dominant: 



30. Sago pondweed (Potamogeton pecti- 



natus). 

 Secondary species: 



31. Spike rush (Elepcliarls, probably 



glaucescens). 



32. Water smartweed (Polygonum amphi- 



hium) . 



33. Bladderwort (Vtricularia vulgaris). 



FLOATING PLANTS. 



34. Small duckweed (Lemna minor). 



35. Star duckweed (Le?/Mia frisMZoa) . Abun- 



dant. 



36. Water-meal (Wolffla punctata). 



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

 food for wild ducks are Nos. 20, 23, 30, 34, and 35 ; those of less importance are 

 Nos. 1, 2, 4, 5, 6 (27, 31), 8, 18, 22, 25, 26, 28 (32), and 36 ; the remainder are of 

 no known value. 



SWAN LAKE, GARDEN COUNTY. 



September 27-28, 1915. 



Description. — Grazed to water's edge. Water probably alkaline; depth, 8 to 

 10 feet ; bottom sandy. No inlet ; outlet into Jones Lake. 



Description of Vegetation. 



shore plants. 



About as for Crescent Lake ; in addition the following : 



1. Wild millet (Echinochloa crus-galli). 



Common. 



2. Rice cut-grass (Homalocenchrus ory- 



zoides). Sparse. 



3. Spike rush (Eleocharis, probably 



glaucescens) . Abundant. 



4. Bushy knotweed (Polygonum ramosis- 



simum) . Sparse. 



5. Heart's-ease (Polygonum- pennsylvanir 



cum). Common. 



6. Western chokecherry (Padus melano- 



carpa). Rare. 



7. Wild bean (Strophostyles pauciflora) .* 



Mature fruit. 



8. Touch-me-not (Impatiens iiflora). 



Sparse. 



9. Willow herb (Epilobium linear e) . Com- 



mon, 



10. Water hoarhound (Lycopus asper). 



Common. 



11. Black nightshade (Solanum nigrum). 



Rare. 



12. Bushy goldenrod (Euthamia gramini- 



foUa) . Common. 



13. Sunflower (HeUanthus annuus). 



14. Bur marigold (Bidens laevis). 



SEMISUBMERGED PLANTS. 



Dominant: 



15. Tule (Scirpus validus). 

 Secondary species: 



16. Cat-tail (Typha latifolia). 



17. Bur reed (Sparganium eurycarpum) . 



18. Cord-grass (Spartina gracilis). 



19. Spike rush (Eleocharis, probably 



glaucescens) . 



20. Water smartweed (Polygonum ampM- 



bium) . 



