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. 



( Spirode la polyrhiza) . 



Wild-duck foods. — Plants in tlie 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. 



SHORE PLANTS. 



Grasses, sedges, etc., as for Dewey Lake. 



MARSH PLANTS. 



Small amount at west side. 



1. Cord-grass (Spartina michauanana) . 



2. Straw sedge (Cyperus strigosus). 



Abundant. 



3. Spike rush (Eleocharis acuminata). 



4. Spike rush {Eleocharis adcularis). 



Common. 



5. Big bulrush (Scirpus occidentalis) . 



6. Kush (Juncus ialticus). Common. 



7. Rush (Juncus torreyi) . Common. 



8. Dragon-head ( Draco eephalum, virgini- 



anum). 



9. Marsh mint (Stachys palustris). 



SEMISUBMERGED PLANTS. 



Dominant: 



10. Big bulrush (Soirpus occidentalis).* 

 Secondary species: 



11. Wapato (Sagittaria latifolia). 



12. Spike rush (Eleocharis acuminata). 



Common. 



13. Water smartweed (Polygonum amphi- 



MuWy). 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 (Najas flexilis). Com- 



mon. 



19. Water smartweed (Polygonum amphi- 



liiuni) . Sparse. 



20. White water crowfoot (Batrachium, 



divartcatum) .* Common; flowers. 



21. Coontail (Ceratophyllum demersum). 



Common. 



22. 



Star duckweed 

 Abundant. 



( Lemna 



FLOATING PLANT. 

 trisulca).* \ 



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

 food for wild ducks are: Nos. 5 (10), 11, 15, 17, 18, 21, and 22; those of less im- 

 portance are: Nog, 1, 2, 3 (12), 4, 13 (19), 14, and 16; the remainder are of no 

 JiDowD value. 



