NEBRASKA WILD-DUCK FOODS. 
73 
SEMISUBMERGED PLANTS. 
Dominant: 
20. Tule (Scirpus validus). 
Secondary species: 
21. Cat-tail (Typha latifolia). 
22. Bur reed (Sparganium eurycarpum). 
23. Wapato (Sagittaria latifolia). 
24. Reed (Phragmites communis). 
25. Cord-grass (Spartina gracilis) . 
26. Three-square (Scirpus americanus) . 
27. Spike rush (Eleocharis, probably 
glaucescens) . 
28. Water smartweed (Polygonum amphi- 
bium ) . 
29. Water hemlock (Cicuta maculatd). 
SUBMERGED PLANTS. 
32. Water smartweed (Polygonum amphi- 
bium). 
33. Bladderwort (Utricularia vulgaris). 
Dominant: 
30. Sago pondweed (Potamogeton pecti- 
natus) . 
Secondary species: 
31. Spike rush (Eleocharis, probably 
glaucescens) . 
FLOATING PLANTS. 
34. Small duckweed (Lemna minor). 36. Water-meal (Wolffia punctata) . 
35. Star duckweed (hem na trisulca). Abun 
dant. 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are Nos. 20, 23, 30, 34, and 35 ; those of less importance are 
Nos. 1, 2, 4, 5, 6 (27, 31), 8, 18, 22, 25, 26, 28 (32), and 36; the remainder are of 
no known value. 
SWAN LAKE, GARDEN COUNTY. 
September 27-28, 1915. 
Description. — Grazed to water's edge. Water probably alkaline; depth, 8 to 
10 feet ; bottom sandy. No inlet ; outlet into Jones Lake. 
Description of Vegetation. 
shore plants. 
About as for Crescent Lake ; in addition the following 
1. Wild millet (Echinochloa crus-galli). 
Common. 
2. Rice cut-grass (Homalocenchrus ory- 
zoides). Sparse. 
3. Spike rush (Eleocharis, probably 
glaucescens). Abundant. 
4. Bushy knotweed (Polygonum ramosis- 
simum). Sparse. 
5. Heart's-ease (Polygonum pennsylvani- 
cum). Common. 
6. Western chokecherry (Padus melano- 
carpa). Rare. 
7. Wild bean (Strophostyles pauciflora) .* 
Mature fruit. 
8. Touch-me-not (Impatiens Mflora). 
Sparse. 
9. Willow herb ( E pilobium lineare) . Com- 
mon. 
10. Water hoarhound (Lycopus asper). 
Common. 
11. Black nightshade (Solanum nigrum). 
Rare. 
12. Bushy goldenrod (Euthamia gramini- 
folia). Common. 
13. Sunflower (HeUanthus annuus). 
14. Bur marigold (Bidens laevis). 
SEMISUBMERGED PLANTS. 
Dominant: 
15. Tule (Scirpus validus). 
Secondary species: 
16. Cat-tail (Typha latifolia). 
17. Bur reed (Sparganium eurycarpum). 
18. Cord-grass (Spartina gracilis). 
19. Spike rush (Eleocharis, probably 
glaucescens). 
20. Water smartweed (Polygonum amphd- 
bium) . 
