NEBRASKA WILD-DITCK FOODS. 71 
CRESCENT LAKE, GARDEN COUNTY. 
September 26, 1915. 
Description— Grazed to shore line on east and south sides. Mostly open 
water, probably somewhat alkaline ; average greatest depth 10 to 11 feet ; bot- 
tom sandy. No current except that caused by wind. Inlet from lake at south- 
west end. 
Distribution of Vegetation. 
shoee plants. 
About as for Gimlet Lake ; in addition, 
1. Redtop (Agrostis alba).* 
2. Straw sedge (Cyperus strigosus) .* Ma- 
ture fruit ; common. 
3. Sedge {Cyperus schiveindtsii) .* Mature 
fruit. 
the following: 
4. Water hoarhound {Lycopus ameri- 
canus).* Mature fruit; common. 
5. Blue verbena {Verbena hastata).* Ma- 
ture fruit. 
6. Willow aster {Aster salicifolius) .* 
Flowers. 
SEMISUBMERGED PLANTS. 
Dominant: 
7. Tule {Scirpus validus). 
Secondary species: 
8. Cat-tail {Typha latifolia). 
9. Bur reed {Sparganium eurycarpum) . 
Common. 
Also, some of the shore plants growing in shallow water, as : 
10. Water plantain {Alisma subcordatum) . 
Common. 
11. Wapato (Sagittaria latifolia). Com- 
mon. 
12. Arrow-grass {Triglochin maritima) . 
13. Wild millet {Echinochloa crus-galli). 
Common. 
14. Reed {Phragmites communis) . Common. 
15. Cordgrass {Spartina gracilis). Com- 
mon. 
16. Bog reedgrass {Calamagrostis inex- 
pansa). 
17. Rush {Juncus balticus). 
18. Rush {Juncus dudleyi) . 
19. Rush {Juncus torreyi). 
20. Water smartweed {Polygonum amphi- 
bium). 
21. Water hemlock {Cicuta maculata). 
Sparse. 
SUBMERGED PLANTS. 
Dominant: 
22. Sago pondweed {Potamogeton pecti- 
natus) . 
Secondary species: 
23. Curly pondweed {Potamogeton per- 
foliaius richardsonii) .* Immature 
fruit ; rare. 
24. Water smartweed {Polygonum amphi- 
bium). 
floating plants. 
25. Butterflywort (Riccia nutans) .* 
26. Small duckweed {Lemna minor). 
27. 
28. 
Star duckweed {Lemna trisulca). 
Water-meal {Wolffla punctata). 
Wild-duck foods. — Plants in the above list which have considerable value as 
food for wild ducks are : Nos. 7, 11, 22, 26, and 27 ; those of less importance are : 
Nos. 2, 3, 9, 10, 12, 13, 15, 20 (24), 23, and 28; the remainder are of no known 
value. 
BEAVER (OR BLUE) LAKE, GARDEN COUNTY. 
September 27-28, 1915. 
Description. — Practically all open water; probably somewhat alkaline; aver- 
age greatest depth 15 to 16 feet ; bottom sandy. Inlet from Jones Lake ; outlet 
into Crescent Lake ; probably some current flowing east. 
