76 



BULLETIN •794, U. S. DEPARTMENT OF AGHICULTUEE. 



SEMISUBMEBGED PLANTS. 



Dormnant: 



1. Tule {Scirpus validus). 

 Secondary species: 



2. Cat-tail (Typha latifoUa). 



3. Bur reed (Sparganium eurycarpum) . 



4. Water plantain {AUsma 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- 



phiMum). Common. 

 10. Water hemlock (Cicuta maculata). 



SUBMERGED PLANTS. 



11. Musk grass (Chara sp.). 



12. Sago pondweed (Potamogeton pectina- 



tus). 



13. Small pondweed (Potamogeton pusil- 



lus). 



14. Spike rush (Eleocliaris acicularis). 



15. Spike rush (Eleocharis, probably 



glaucescens) . 



16. Water smartweed (Polygonum amphi- 



Mum). 



17. White water crowfoot (Batrac7iiu7n di- 



varicatiim) .* 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. 



DiSTEIBUTION OF VEGETATION. 

 SHORE PLANTS. 



Grasses, etc., as listed for neighboring lakes; in addition the following: 

 1. Spider flower (Cleome serrulata).* Mature fruit. 



SEMISUBMEBGED 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. 



