NEBEASKA WILD-DUCK FOODS. 
51 
FLOATING PLANTS. 
Dominant: 
52, Star duckweed (Lemna trisulca) . 
Secondary species: 
53. Small duckweed (Lemna minor). 
54. Big duckweed (Spirodela polyrhiza) 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are: Nos. 21, 24 (33), 32, 34, 39, 41, 43, 46, 52, 53, and 54; 
those of less importance are: Nos. 1, 2, 5, 6 (25), 7, 11, 20, 23, 26 (36), 27, 29, 
37, 42, 44, 45, 47, 49, and 50 ; the remainder are of no known value. 
WATTS LAKE, CHERRY COUNTY. 
August 29, 1915. 
Description. — Large marsh at west end of lake, which it is not safe to pene- 
trate on account of the soft mucky bottom. Lake proper is mostly open water ; 
depth 5 to 6 feet ; bottom largely muck. No inlet or outlet. 
DISTRIBUTION OF VEGETATION. 
SHORE PLANTS. 
Grasses, sedges, etc., as for Dewey and Hackberry Lakes. In addition the 
following : 
l 
Sensitive rem (Onoclea sensibilis) .* 
Common on mucky shore ; in fruit. 
2. Water smartweed (Polygonum amphi- 
oium).* Not abundant ; flowers. 
Whorled loosestrife (Lysimachia quadri- 
folia).* Sparse. 
MARSH PLANTS. 
Dominants: 
4. Reed (Phragmites communis). 
5. Big bulrush (Scirpus ocoidentalis) . 
Secondary species: 
6. Bur reed (Sparganium eurycarpum.) 
7. Cat-tail (Typha latifolia) . 
8. Wapato (Sagittaria latifolia) * Com- 
mon. 
9. Wild rice (Zizania palustris). Abun- 
dant. A rice field in middle of marsh 
comprises about one-fifth of entire 
area. 
10. Spike rush (Eleocharis acuminata). 
11. Sedge (Carex utriculata) . 
12. Rush (Juncus dudleyi). Sparse. 
13. Willows along marsh bank (Salix). 
SEMISTJBMERGED PLANTS. 
Com- 
Dominants: 
14. Big bulrush (Scirpus occidentalis) . 
15. Spike rush (Eleocharis acuminata) . 
16. Wapato (Sagittaria latifolia). Com- 
mon. 
17. Wild rice (Zizania palustris). Sparse; 
shows effect of high water. 
Other smaller sedges and rushes listed among marsh plants occur also in 
shallow water. 
SUBMERGED PLANTS. 
18. Reed (Phragmites communis). 
mon. 
19. Water smartweed (Polygonum amphi- 
oium). 
20. Water hemlock (Cicuta maculata). 
Sparse. 
Dominant: 
21. Eelgrass pondweed (Potamogeton com- 
pressus). 
Secondary species: 
22. Water moss (Drepanocladus sp.) Com- 
mon. 
23. Sago pondweed (Potamogeton pecti- 
natus). Abundant. 
24. Small pondweed (Potamogeton pusil- 
lus). Common. 
25. Curly pondweed (Potamogeton per- 
foliatus richardsonii) . Common. 
26. Illinois pondweed (Potamogeton illi- 
noensis) . Common, 
27. Long-leaved pondweed (Potamogeton 
americanus ) . Common. 
28. Bushy pondweed (Najas flexilis) . Com- 
mon. 
29. Water smartweed (Polygonum amphi- 
bium). 
30. Coontail (Ceratophyllum demersum). 
Common. 
31. Spatterdock (Nymphaea advena). Com- 
mon. 
32. Water milfoil (Myriophyllum spicatum) . 
Abundant. 
33. An alga (Nostoc verrucosum). Abun- 
dant. 
