56 
BULLETIN 794, U. S. DEPARTMENT OF AGRICULTURE. 
SUBMERGED PLANTS. 
Dominants: 
21. Coontail (Ceratophyllum dcmersum) . 
22. Spatterdock (XympJuiea advena) .* 
Seedlings. 
Secondary species: 
23. Musk grass (Chara sp.).* Abundant. 
24. Water moss (Drepanocladus sp.). Abun- 
dant. 
25. Sago pondweed (Potamogeton pectina*- 
tus). Abundant. 
26. Eelgrass pondweed (Potamogeton com- 
P)-essus). Common. 
27. Small pondweed (Potamogeton pusil- 
lus). Common. 
28. Illinois pondweed (Potamogeton illi- 
noensis). 
29. Floating pondweed (Potamogeton na- 
tans). 
30. Variable pondweed (Potamogeton heter- 
opliyllus) . 
31. Curly pondweed (Potamogeton per- 
foliatus richardsonii) . 
32. Bushy pondweed (Xajas flexilis). Com- 
motk. 
33. Water smartweed (Polygonum amphi- 
oium). Abundant. 
34. White water crowfoot (Batrachium di- 
raricatum ) . 
35. Spatterdock (Xymphaea advena). Com- 
mon. 
36. Water milfoil (Ityriophyllum spicatum). 
Abundant. 
37. Bladderwort (Utricularia vulgaris). 
Abundant. 
FLOATING PLANTS. 
38. Big duckweed (Spirodela polyrhiza). 
39. Small duckweed (Lemna minor). 
40. Star duckweed (Lemna trisulca) . Com- 
mon. 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are : Nos. 2 (16), 3, 11, 13, 21, 23, 25, 27, 30, 32, 38, 39, and 
40; those of less importance are: Xos. 1, 4, 5, 7, 10 (33). 15, 17, 20, 22 (35), 
26, 28, 29, 31, 34, and 36 ; the remainder are of no known value. 
SWEETWATER LAKES, CHERRY COUNTY. 
September 6, 1915. 
Description. — Marshy at west end. Well filled with submerged vegetation. 
Average greatest depth about 3 to 3? feet ; bottom mostly sandy. Overflow from 
one lake to another during high water. 
Distribution of Vegetation. 
shoee plants. 
Typical mixture of grasses, etc., as listed for other lakes. Grazed mostly to 
shore line. 
MARSH PLANTS. 
1. Water plantain (Alisma subcordatum) . 
Common. 
2. Wapato (Sagittama latifolia). 
3. Reed (Phragmites communis). 
4. Big bulrush (Scirpus occidentals). 
5. Spike rush (Eleocharis acuminata) . 
6. Rush (Juncus torreyi).* 
7. St. John's-wort (Hypericum puncta- 
tum).* Mature fruit. 
8. Willow herb (Epilobium lineare) * 
9. Water hemlock (Cicuta maculata). 
10. Water hemlock (Cicuta oulbifera).* 
11. Skullcap (Scutellaria galericulata).* 
Flowers. 
12. Purple boneset (Eupatorium purpu- 
reum).* Flowers. 
13. Sticktight (Bidens trichosperma).* 
Flowers. 
14. Willow aster (Aster salicifolius).* 
Flowers. 
15. Sunflower (Helianthus annuus).* Flow- 
ers. 
SEMISUBMERGED PLANTS. 
Dominants: 
16. Wapato (Saoittaria latifolia). 
17. Spike rush (Eleocharis acuminata). 
Secondary species: 
lb. Water plantain (Alisma suhcor datum), 
19. Cord-grass (Spartina michauxiana) . 
20. Big bulrush (Scirpus occidentalis) . 
21. Water smartweed (Polygonum amphi- 
bium). 
