NEBRASKA WILD-DUCK FOODS. 59 



FLOATING PLANTS. 



40. Big duckweed (Spirodela polyrhiza) . I 42. Star duckweed (Lemna trisulca). 



41. Small duckweed (Lemna minor). I 



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

 food for wild ducks are : Nos. 13, 16, 17, 23, 26, 30, 32, 33, 37, 40, 41, and 42 ; 

 those of less importance are : Nos. 2, 9, 15 (27), 18, 19, 21 (35), 24, 25, 28, 29, 31, 

 34, 36, and 38 ; the remainder are of no known value. 



RED DEER LAKE, CHERRY COUNTY. 



September 10, 1915. 



Descnption. — Little or no marsh. Mostly open water ; average greatest depth, 

 7 to 8 feet. Bottom generally sandy. Inlet from Ballard Swamp during over- 

 flow period ; outlet into Goose Creek and thence into Niobrara River. 



DiSTKIBXTTION OF VEGETATION. 

 SHOKE PLANTS. 



Typical mixture of grasses, sedges, goldenrods, etc., as listed for other lakes, 

 including the following: 

 1. Saltgrass (Diatichlis spicata). | 



SEMISt'BatERGED PLANTS. 



Dominants: 



2. Cat-tail {Typha latifolia). 



3. Big bulrush (Scirpus occidentalis) . 



Secondary species: 



4. Wapato (Sagittaria latifolia). Com- 



mon. 



5. Reed (Phragmites communis). Com- 



mon. 



SUBMERGED PLANTS. 



Dominants: 



6. Sago pondweed (Potamogeton pectina- 



tus). 



7. Coontail (Ceratophyllum demersum). 

 Secondary species: 



8. Musk grass (Chora sp.). Abundant. 



9. Floating pondweed (Potamogeton na- 



tans). 



10. Curly pondweed (Potamogeton per- 



foliatus richardaonii) . 



11. Illinois pondweed (Potamogeton illi- 



noensis). 



12. Small pondweed (Potamogeton pusil- 



liis). 



13. White water crowfoot (Batrachium di- 



varicatum) . 



FLOATING PLANTS. 



16. star duckweed (Lemna trisulca). 

 Abundant. 



14. Greater duckweed (Spirodela poly- 



rhiza) . Abundant. 



15. Small duckweed (Lemna minor). 



Abundant. 



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

 food for wild ducks are : Nos. 3, 4, 6, 7, 8, 12, 14, 15, and 16 ; those of legs Im- 

 portance are : Nos. 1, 9, 10, 11, and 13 ; the remainder are of no known value. 



BALLARD SWAMP, CHERRY COUNTY. 



September 10, 1915. 



Description. — Vegetation abundant and in good condition. Fresh water ; very 

 little open ; depth, 4 to 5 feet. Bottom in general very mucky ; sandy in a few 

 places. Inlet from Trout Lake ; outlet during high water into Red Deer Lake. 



