76 
BULLETIN 794, U. S. DEPARTMENT OF AGRICULTURE. 
SEMISUBMEBGED PLANTS. 
Dominant: 
1. Tule (Scirpus validus). 
Secondary species: 
2. Cat-tail (Typha latifolia). 
3. Bur reed (Sparganium eurycarpum) . 
4. Water plantain (Alisma subcordatum). 
5. Wapato (Sagittaria latifolia). 
6. Cord-grass (Spartina gracilis). 
7. Reed (Phragmites communis). Com- 
mon. 
8. Three-square (Scirpus americanus). 
9. Water smartweed (Polygonum am- 
phibium). Common. 
10. Water hemlock (Cicuta maculata). 
SUBMEEGED PLANTS. 
11. Musk grass (Chara sp.). 
12. Sago pondweed (Potamogeton pectina- 
tus). 
13. Small pondweed (Potamogeton pusil- 
lus). 
14. Spike rush (Eleocharis acicularis). 
15. Spike rush (Eleocharis, probably 
glaucescens) . 
16. Water smartweed (Polygonum amphi- 
bium). 
17. White water crowfoot (Batrachium di- 
varication).* Common. 
18. Bladderwort (Utricularia vulgaris). 
FLOATING PLANTS. 
19. Star duckweed (Lemna trisulca) . Very I 20. Small duckweed (Lemna minor). 
abundant. | 21. Water-meal (Wolffla punctata). 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are Nos. 1, 5, 11, 12, 13, 19, and 20 ; those of less impor- 
tance are: Nos. 3, 4, 6, 8, 9 (16), 14, 15, 17, and 21; the remainder are of no 
known value. 
PETERSON LAKE NO. 2, GARDEN COUNTY. 
October 2, 1915. 
Description. — Bottom mucky ; average depth 4 feet. No inlet or outlet. 
Distribution of Vegetation, 
shore plants. 
Grasses, etc., as listed for neighboring lakes; in addition the following: 
1. Spider flower (Cleome serrulata).* Mature fruit. 
SEMISUBMERGED PLANTS. 
Dominant: 
2. Tule (Scirpus validus). 
Secondary species: 
3. Three-square (Scirpus americanus). 
SUBMERGED PLANTS. 
Dominant: 
4. Widgeon grass (Ruppia occidentalis).* 
Immature fruit ; practically fills lake, 
which was covered with ducks ap- 
parently feeding on this plant. 
Secondary species: 
5. Sago pondweed (Potamogeton pectina- 
tus). 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are: Nos. 2, 4. and 5; one of less importance is 3; the 
remaining one is of no known value. 
