NEBRASKA WILD-DUCK FOODS. 71 



CRESCENT LAKE, GARDEN COUNTY. 



Septemljer 26, 1915. 



Description.— Grazed to shore line on east and south sides. Mostly open 

 water, probably somewhat alkaline; average greatest depth 10 to 11 feet; bot- 

 tom sandy. No current except that caused by wind. Inlet from lake at south- 

 west end. 



DiSTEIBUTION or VEGETATION. 

 SHORE PLANTS. 



About as for Gimlet Lake ; in addition, the following : 



1. Redtop (Agrostis alba).* 



2. Straw sedge {Cypeius strigosus) .* Ma- 



ture fruit ; common. 



3. Sedge (Cyperus schweindtsii) .* Mature 



fruit. 



4. Water hoarhound (Lycopus ameri- 



caniis).* Mature fruit; common. 



5. Blue verbena {Verl>e7ia hastata).* Ma- 



ture fruit. 



6. "Willow aster (Aster salicifolius).* 



Flowers. 



SEMISTJBMEEGED PLANTS. 



Dominant: 



7. Tule (Scirpua validus) . 

 Secondary species: 



8. Cat-tail (Typha latifolia). 



9. Bur reed (i^pargaiiium eurycarpum) . 



Common. 



10. Water plantain (Alisma suhcordatum). 



Common. 



11. Wapato (Sagittaria latifolia). Com- 



mon. 



Also, some of the shore plants growing in shallow water, as : 



12. Arrow-grass (Triglochin maritima) . 



13. Wild millet (Echinochloa crus-galU). 



Common. 



14. Reed (Phragmites communis). Common. 



15. Cordgrass (Spartviia gracilis). Com- 



mon. 



16. Bog reedgrass (Calamagrostis inex- 



pansa). 



17. Rush {Juncus talticus). 



18. Rush {Juncus dudleyi). 



19. Rush (Juncus torreyi) . 



20. Water smartweed (Polygonum, amphi- 



bium). 



21. Water hemlock (Cicuta maculata) . 



Sparse. 



STJBMEKGED PLANTS. 



Dominant: 

 22. Sago pondweed (Potamogeton pecti- 

 natus) . 



Secondary species: 



23. Curly pondweed (Potamogeton per- 



foliatus richardsonii) .* Immature 

 fruit ; rare. 



24. Water smartweed (Polygonum amphi- 



Mum). 



FLOATING PLANTS. 



25. Butterflywort (Riccia natans) .* 



26. Small duckweed (Lemna minor). 



27. Star duckweed (Lemna trisulca). 



28. Water-meal (Wolffla punctata) . 



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

 food for wild ducks are : Nos. 7, 11, 22, 26, and 27 ; those of less importance are : 

 Nos. 2, 3, 9, 10, 12, 13, 15, 20 (24), 28, and 28; the remainder are of no known 

 value. 



BEAVER (OR BLUE) LAKE, GARDEN COUNTY. 

 September 27-28, 1915. 



Description. — Practically all open water ; probably somewhat alkaline ; aver- 

 age greatest depth 15 to 16 feet ; bottom sandy. Inlet from Jones Lake ; outlet 

 into Crescent Lake ; probably some current flowing east. 



