52 BULLETIN 794, U. S. DEPARTMENT OF AGRICULTURE. 
FLOATING PLANTS. 
34. Big duckweed (Spirodela polyrhiza) . I 36. Star duckweed (Lemna trisulca^. 
35. Small duckweed (Lemna minor). 
WiW-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. 
SHORE PLANTS. 
Grasses, sedges, etc., as listed for neighboring bodies of water. In addition 
the following: 
1. Sedge (Carex s cop aria) * On wet shore i 
and in bog. 
MARSH PLANTS. 
Dominants: 
2. Reed (Phragmites communis). 
3. Big bulrush (Scirpus occidentalis). 
Secondary species: 
4. Wapato (Sagittaria latifolia). Common. 
5. Wild rice (Zizania palustris). Abundant. 
6. Spike rush (Eleocharis acuminata). 
Common. 
7. Water hemlock (Cicuta maculata). 
Sparse. 
8. Burweed (Iva xanthifolia) . 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 (Sporobolus asperifolius) . 
In shallow water. 
14. River bulrush (Scirpus fuviatilis) .* 
Sparse. 
15. Spike rush (Eleocharis acuminata) . 
16. Water smartweed (Polygonum amphi- 
bium). Common. 
17. Water hemlock (Cicuta maculata). In 
shallow water. 
SUBMERGED PLANTS. 
Dominants: 
18. Coontail (Ceratophyllum demersum). 
Abundant. 
19. Water milfoil (Myriophyllum spica- 
tum). Abundant. 
Secondary species: 
20. Small pondweed (Potamogeton pusil- 
lus).* 
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. 
