52 BULLETIN 794, U. S. DEPARTMENT OF AGRICULTUEE. 



FLOATING PLANTS. 



34. Big duckweed (Spirodela polyrhiea) . I 36. Star duckweed (Lemna triaulca^. 



35. Small duckweed (Lemna minor). \ 



Wild-duck foods. — Plants in the above list which have considerable value as 

 food for wild ducks are: Nos. 5 (14), 8 (16), 9 (17), 23, 24, 28, 30, 34, 35, and 

 36; those of less importance are: Nos. 2 (19, 29), 6, 10 (15), 11, 21, 25, 26, 

 27, 31, and 32 ; the remainder are of no known value. 



TROUT LAKE, CHERRY COUNTY. 



August 31, 1915. 



Description. — Considerable marsh on southeast side of lake ; small amount on 

 south and west sides. Open water extensive; greatest average depth 8 to 9 

 feet. Outlet Into Ballard swamp. 



Distribution of Vegetation. 



SHOEE plants. 



Grasses, s'edges, etc., as listed for neighboring bodies of water. In addition 

 the following: 



1. Sedge (Carex scoparia) .* On wet shore i 

 and in bog. | 



MARSH plants. 



Dominants: 



2. Reed (PhragnUtes communis). 



3. Big bulrush (Scirpus occidentalis) . 



Secondary species: 



4. Wapato (Sagittaria latifolia). Common. 



5. Wild rice (Zitsania palustris) . Abundant. 



6. Spike rush {Eleocharis acuminata). 



Common. 



7. Water hemlock (Cicuta maculata). 



Sparse. 



8. Burweed (Iva xanthifoUa). Common. 



Other smaller sedges and rushes listed for neighboring bodies of water are 

 common in the marsh and bog areas. The marsh consists of rice patches alter- 

 nating with rush fields. 



SEMISUBMERGED PLANTS. 



Dominant: 

 9. Big bulrush (Scirpus occidentalis). 

 Secondary species: 



10. Cat-tail (Typha latifolia). Sparse. 



11. Wapato (Sagittaria latifolia). Com- 



mon. 



12. Reed (Phragmites communis). Abun- 



dant. 



13. Dropseed (Sporoiolus asperif alius). 



In shallow water. 



14. River bulrush (Scirpus fluviatilis) .* 



Sparse. 



15. Spike rush (Eleocharis acuminata). 



16. Water smartweed (Polygonum, amphi- 



bium) . Common. 



17. Water hemlock (Cicuta maculata). In 



shallow water. 



SUBMERGED PLANTS. 



Secondary species: 

 20. Small pondweed (Potamogeton pusil- 

 lus).* 



Dominants : 



18. Coontail (Ceratophyllum demersum). 



Abundant. 



19. Water milfoil (Myriophyllum spica- 



tum). Abundant. 



Wild-duck foods. — Plants in the above list which have considerable value as 

 food for wild ducks are: Nos. 3 (9), 4 (11), 5, 14, 18, and 20; those of less im- 

 portance are: Nos. 1, 6 (15), 16, and 19; the remainder are of no known value. 



