NEBRASKA WILD-DUCK FOODS. 



43 



MARSH LAKE, BROWN COUNTY. 



August 12-13, 1915. 



Description. — Fresh-water lake, well filled with vegetation. Little open water, 

 average greatest depth 6 to 7 feet, bottom mucky except at east end. No inlet 

 or outlet. 



Distribution of Vegetation. 



shore plants. 



A mixture in which no species are dominant is found in a narrow zone of wet 

 meadow (2 to 5 rods) except on east side. 



10. 



Cord-grass (Spartina michauxiana) .* 



Flowers. 

 Switchgrass (Panicum virgatum) .* 

 Hair-grass (Agrostis hyemalis).* 

 Redtop (Agrostis alha).* 

 Bog reedgrass (Oalamagrostis inex- 



pansa).* 

 Couch-grass (Agropyron repens). 

 Reed canary-grass (Phalaris arundina- 



cea).* 

 Straw sedge {Gyperus strigosus).* 



Mature fruit. 

 Shining sedge (Cyperus rirularis).* 



Immature fruit. 

 Three-way sedge (Dulichhtm arundina- 



ceum ) . * Flowers. 



11. Sedge (Carex vulpinoidea) .* Mature 



fruit. 



12. Sedge (Carex scoparia).* Mature 



fruit. 



13. Rush (Juncus nodosus).* 



14. Rush (Juncus canadensis).* Abun- 



dant ; flowers to immature fruit. 



15. Rush (Juncus marginatus) .* Mature 



fruit. 



16. Rush (Juncus dudleyi).* Capsules 



empty. 



17. Water hemlock (Cicuta maculata).* 



Flowers. 



18. Marsh mint (Stachys palustris).* 



Flowers. 



19. Water marigold (Bidens beckii) .* 



SEMISXJBMEEGED PLANTS. 



Dominants: 



20. Big bulrush (Scirpus occidentalis). 



21. Spikerush (Eleocharis acuminata). 



22. Water smartweed (Polygonum amphih- 



ium) . 



Secondary species: 



23. Western water plantain (Alisma hre- 



vipes).* Flowers to Immature fruit. 



24. Wapato (Sagittaria latifolia). 



25. Crested wapato (Sagittaria cristata). 



26. Reed (Phragmites communis) . 



27. Bush (Juncus ialticus).* Flowers. 



SUBMERGED PLANTS. 



Dominants : 



28. Curly pondweed (Potamogeton perfoli- 



atus richardsonii) . 



Secondary species: 



29. Sago pondweed (Potamogeton pectina- 



tus).* 



30. Eelgrass pondweed (Potamogeton com- 



pressus). 



31. Small pondweed (Potamogeton pusil- 



lus).* Flowers. 



32. Floating pondweed (Potamogeton na- 



tans). 



33. White water crowfoot (Batrachium cir- 



cinatum) .* 



34. Bladderwort (Utricularia vulgaris) .* 



35. Water milfoil (Myriophyllum spica- 



tum). 



FLOATING PLANT. 



36. Star duckweed (Lemna trisulca).* I 



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

 food for wild ducks are : Nos. 20, 24, 29, 31, and 36 ; those of lesser importance 

 are : Nos. 1, 2, 8, 9, 11, 12, 19, 21, 22, 28, 30, 32, 33, and 34 ; the remainder are of 

 no known value. 



