66 
BULLETIN 794, U. S. DEPARTMENT OF AGRICULTURE. 
FLOATING PLANT. 
38. 
Star duckweed (Lcvina trisulca).* 
Abundant. 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are : Nos. 20, 24, 31, 32, 33, 36, and 38 ; those of less impor- 
tance are : Xos. 1, 3, 4, 5, 7, 22, 23, 25, 26, 27 (35), 28, 30, and 34; the remainder 
are of no known value. 
WHITE WILLOW LAKE, CHERRY COUNTY. 
October 10, 1915. 
Description. — No marsh. Grazed to shore on south and west sides. Well 
filled with vegetation. Fresh water ; depth 6 to 7 feet ; bottom mostly sandy. 
No inlet or outlet. 
DlSTKIBUTION OF VEGETATION. 
SHORE PLANTS. 
-. T3'pical wet-meadow plants. 
1. Saltgrass (Distichlis spicata). Abun- 
dant. 
2. Western w beat-grass (Agropyron 
smithii). Common. 
3. Switcbgrass (Panicum virgatum). 
Abundant. 
4. Bog reedgrass (Calamagrostis inex- 
pansa).* Mature fruit. 
5. Fragrant sedge (Cyperus inflexus). 
Abundant. 
6. Straw sedge (Cyperus strigosus).* 
Mature fruit. 
7. Shining sedge (Cyperus rivularis) .* 
Mature fruit. 
8. Spike rush (Eleocharis palustris) * 
Mature fruit. 
9. Spike rush (Eleocharis acicularis) . 
Abundant. 
10. Three-way sedge (Dulichium arundi- 
naceum). Common. 
11. Sedge (Carex vulpinoidea) .* 
12. Sedge (Carex scoparia) .* Mature fruit. 
13. Rush (Juncus marginatum).* 
14. Rush (Juncus ca7iadensis) . Abundant. 
15. Willow (Salix). Sparse. 
16. Golden dock (Rumex persicarioidcs) . 
Common. 
17. Bushy knotweed (Polygonum ramosissi- 
mum). Sparse. 
18. Water hemlock (Cicuta bulbifera). 
Sparse. 
19. Bugleweed (Lycopus uniflorus). Com- 
mon. 
20. Ragweed (Ambrosia clatior\. Common. 
21. Bushy goldenrod (Euthamia gramini- 
folia). Common. 
22. Bur marigold (Bidens laevis). 
SEMISUBMERGED PLANTS. 
Dominant: 
23. Tule (Scirpus validus). 
Secon dary species : 
24. Wapato (Sagittaria lati folia). 
25. Cord-grass (Spartina michauxiana) .* 
Mature fruit : common. 
26. Bog reedgrass (Calamagrostis inex- 
pansa) . 
SUBMEEGED PLANTS. 
Dominants: 
27. Small pondweed (Potamogeton pusil- 
lus).* Mature fruit: winter buds. 
28. Water milfoil (Myriophyllum spica- 
tum ) . 
Secondary species: 
29. Musk grass (Chara sp.).* Common. 
30. Water moss (Drepanocladus sp.). 
31. Curly pondweed (Potamogeton per- 
foliatus ricliardsonii).* Abundant. 
32. Variable pondweed (Potamogeton lieter- 
ophyllus). 
33. Sago pondweed (Potamogeton pectina- 
tus).* Common. 
34. Bushy pondweed (Xajas flexilis) . Rare. 
35. Spike rush (Eleocharis, probably aci- 
cularis). Common. 
36. Water smartweed (Polygonum amphi- 
bium). Common. 
37. Bladderwort (Utrieularia vulgaris). 
Common. 
38. Butterfly wort (Eiccia natans).* 
39. Big duckweed (Spirodela polyrhiza) 
FLOATING PLANTS. 
40. Star duckweed 
Abundant. 
(Lemna trteulca).* 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are: Nos. 23, 24, 27, 29. 32, 33, 34. 39, and 40; those of 
less importance are: Nos. 1, 3, 5, 6, 7. 8, 9, 11, 12, 25, 28, 31, 35, and 36; the 
remainder are of no known value. 
