NEBRASKA WILD-DUCK FOODS. 59 
FLOATING PLANTS. 
40. Big duckweed (Spirodela polyrhiza). I 42. Star duckweed (Lemna trisulca). 
41. Small duckweed {Lemna minor) . 
WUd-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. 
Description. — 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. 
DISTRIBUTION OF VEGETATION. 
SHOEE PLANTS. 
Typical mixture of grasses, sedges, goldenrods, etc., as listed for other lakes, 
including the following: 
1. Saltgrass (Distichlis spicata). | 
SEMISFBMERGED PLANTS. 
Dominants: 
2. Cat-tail (Typha lati folia). 
3. Big bulrush (Scirpus occ-identalis) 
Seco7idary species: 
4. Wapato (Sagittaria lati folia) . 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 richardsonii) . 
11. Illinois pondweed (Potamogeton illi- 
noemis). 
12. Small pondweed (Potamogeton pusil- 
Jus). 
13. White water crowfoot (Batrachium di- 
varicatum) . 
FLOATING PLANTS. 
16. Star duckweed (Lemna trlsulca), 
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 less 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. Fresb 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. 
