NEBRASKA WILD-DUCK FOODS. 
65 
FLOATING PLANTS. 
54. Star duckweed (Lemna trisulca). 
Common. 
52. Big duckweed (Spirodela polyrhiza). 
Common. 
53. Small duckweed {Lemna minor). 
Common. 
Wild-duck foods. — Plants in the above list which have considerable value 
as food for wild ducks are : Nos. 24, 28, 29, 32, 39, 40, 43, 44, 46, 52, 53, and 54 ; 
those of less importance are: Nos. 1, 2. 3, 6, 10 (36, 48), 11, 20, 26, 27, 31, 33 
(47), 34, 42, 45, 49, and 50; the remainder are of no known value. 
RED WILLOW LAKE, CHERRY COUNTY. 
October 9, 1915. 
Description. — Very small amount of marsh at west end. Well filled with 
vegetation. Fresh water; average greatest depth 4£ feet; bottom mostly 
sandy. No outlet or inlet. No current except as caused by wind. 
Distribution of Vegetation. 
SHORE PLANTS. 
Ma- 
-. Typical wet-meadow plants. 
1. Saltgrass (Distichlis spicata), 
ture fruit ; abundant. 
2. Western wheat-grass (Agropyron 
smithii).* Mature fruit ; common. 
3. Switchgrass (Panicum virgatum) .* Ma- 
ture fruit ; abundant. 
4. Fragrant sedge (Cyperus infexus).* 
Mature fruit ; abundant. 
5. Straw sedge (Cyperus strigosus).* Ma- 
ture fruit ; abundant. 
6. Three-way sedge (Dulichium arundina- 
ceum).* Common. 
7. Spike rush (Eleocharis acicularis) .* 
Mature fruit ; abundant. 
8. Rush (Juncus marginatus) .* Mature 
fruit. 
9. Rush (Juncus canadensis).* Mature 
fruit ; abundant. 
Immature 
balticus).* 
probably interior) 
10. Rush (Juncus 
fruit. 
11. Rush (Juncus, 
Mature fruit. 
12. Willow (Salix prinoides).* Sparse. 
13. Golden dock (Rumex persicarioides) .* 
Mature fruit ; common. 
14. Bushy knotweed (Polygonum ramosissi- 
mum).* Mature fruit; sparse. 
15. Water hemlock (Cicuta bulbifera).* 
Sparse. 
16. Bugleweed (Lycopus uniftorus) .* Flow- 
ers, to mature fruit ; common. 
17. Ragweed (Ambrosia elatior).* Flow- 
ers ; common. 
18. Bushy goldenrod (Euthamia graminifo- 
lia).* Flowers, to mature fruit; 
common. 
19. Bur marigold (Bidens laevis). 
SEMISUBMERGED PLANTS. 
Dominant : 
20. Tule (Scirpus validus). 
Secondary species: 
21. Cat-tail (Typha latifolia). Sparse. 
22. Bur reed (Sparganium eurycarpum) . 
Sparse. 
23. Water plantain (Alisma subcorda- 
tum).* Common. 
Com- 
24. Wapato (Sagittaria latifolia). 
mon. 
25. Cord-grass (Spartina michauxiana) . 
Common. 
26. Three-square (Scirpus americanus). 
Common. 
27. Water smartweed (Polygonum amphibi- 
um).* Mature fruit; common. 
SUBMERGED PLANTS. 
Dominant: 
28. Water milfoil (Myriophyllum spica- 
tum).* Mature fruit. 
Secondary species: 
29. An alga (Nostoc verrucosum). Abun- 
dant. 
30. Curly pondweed (Potamogeton per- 
foliate richardsonii) . Common. 
31. Variable pondweed (Potamogeton heter- 
ophyllus).* Mature fruit; common. 
120368°— 20— Bull. 794 5 
32. Sago pondweed (Potamogeton pecti- 
natus).* Mature fruit; sparse. 
33. Small pondweed (Potamogeton pusil- 
lus).* Winter buds present. 
34. Spike rush (Eleocharis, probably aci- 
cularis).* Common. 
35. Water smartweed (Polygonum amphibi- 
um).* 
36. Coontail (Ceratophyllum demersum).* 
37. Bladderwort (Utricularia vulgaris) * 
