48 
BULLETIN 794, U. S. DEPARTMENT OF AGRICULTURE. 
FLOATING PLANTS. 
53. Star duckweed (Lemna trisulca) .* 
Common. 
54. Small duckweed (Lemna minor).* Com- 
mon. 
55. Big duckweed 
Common. 
(Spirodela polyrhiza) .* 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are : Nos. 24 (36), 28 (33), 38, 42, 44, 47, 48, 53, 54, and 55; 
those of less importance are: Nos. 1, 2, 5, 6, 7, 13, 21, 23, 26 (39), 29, 34, 
40 (49), 43, 45, 46, 50, and 51 ; the remainder are of no known value. 
WILLOW LAKE, CHERRY COUNTY. 
August 23-24, 1915. 
Description. — Little or no marsh ; grazed to water's margin on north, east, 
and south shores. Well filled with vegetation. Open water extensive, average 
greatest depth 9 feet. Inlet from Dewey Lake ; outlet into Trout Lake. 
Distribution of Vegetation. 
shoee plants. 
Grasses, sedges, etc., as for Dewey Lake. 
MAESH PLANTS. 
Small amount at west side. 
1. Cord-grass (Spartina michauxiana) . 
2. Straw sedge (Cyperus strigosus). 
Abundant. 
3. Spike rush (Eleocharis acuminata) . 
4. Spike rush (Eleocharis aoicularis). 
Common. 
5. Big bulrush (Scirpus Occident alls). 
6. Rush (Juncus balticus) . Common. 
7. Rush (Juncus torreyi) . Common. 
8. Dragon-head (Dracocephalum virgini- 
anum). 
9. Marsh mint (Stachys palustris). 
SEMISUBMERGED PLANTS. 
Dominant: 
10. Big bulrush (Scirpus occidentalis) * 
Secondary species: 
11. Wapato (Sagittaria latifolia). 
12. Spike rush (Eleocharis acuminata). 
Common. 
13. Water smartweed (Polygonum amphi- 
bium). Common. 
SUBMERGED PLANTS. 
(Myriophyllum spica- 
Dominant: 
14. Water milfoil 
turn).* 
Secondary species: 
15. Sago pondweed (Potamogeton pecti- 
natus). Common. 
16. Eelgrass pondweed (Potamogeton com- 
pressus).* Common; nearly mature 
fruit ; winter buds. 
17. Small pondweed (Potamogeton pusil- 
lus).* Common; immature fruit. 
18. Bushy pondweed (Xajas flcxilis). Com- 
mon. 
19. Water smartweed (Polygonum amphi- 
bium) . Sparse. 
20. White water crowfoot (Batrachium 
divaricatum).* Common; flowers. 
21. Coontail (Ceratophylhun demersum). 
Common. 
FLOATING PLANT. 
22. Star duckweed (Lemna trisulca).* i 
Abundant. 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are: 2vos. 5 (10), 11, 15, 17, 18, 21, and 22; those of less im- 
portance are: >*os. 1, 2, 3 (12), 4, 13 (19), 14, and 16; the remainder are of no 
known value. 
