70 



BULLETIN 794, U, S. DEPARTMENT OF AGRICULTURE. 



GIMLET LAKE, GARDEN COUNTY. 



September 24, 1915. 



Description. — Lake well filled with vegetation. Small amount of open water: 

 average greatest depth Si feet; bottom mostly mucky. No inlet or outlet. 



DiSTEIBUTION OF VeGETA-TION. 

 SHOEE PLANTS. 



1. Arrow-grass (Triglochin maritima).* 



Mature fruit ; common. 



2. Switchgrass {Panicum virgatum) . Com- 



mon. 



3. Barbed witcligrass (Panicum 6arbt- 



pulnnatum). Sparse. 



4. Wild rye (Elymiis canadensis). Com- 



mon. 



5. Cord-grass {Spartina gracilis). Com- 



mon. 



6. Saltgrass {Distichlis spicata). Sparse. 



7. Bog reedgrass (Calamagrostls inew- 



pansa). Abundant. 



8. Satin grass (ifuhlenhergia foliosa). 



Common. 



9. Sedge (Cyperus speciosus). Abundant. 

 10. Sedge (Carea? diandra teretiuscula) . 



Common. 



11. Sedge (Carex haydeni).*'^ Common. 



12. Sedge (Carex vulpinoidea) .* Flowers; 



sparse. 



13. Rush (Juncus haltlcus). Abundant. 



14. Rush (Juncus torreyi).* Abundant. 



15. Rush (Juncus dudleyi).* Common. 



16. Water smartweed (Polygonum am- 



phibium).* Common. 



17. Ragweed (Ambrosia elatior). Common. 



18. Bur marigold (Bidens laevis). Com- 



mon. 



19. Sunflower (Helianthus annuiis). 



Sparse. 



20. White wreath-aster (Aster multiflorua) . 



Sparse. 



SEMISUBMEEGED PLANTS. 



Dominant: 



21. Tule (Scirpus validus).* Mature fruit. 

 Secondary species: 



A number of plants listed under shore 

 vegetation grow in shallow water in 

 addition to the following : 



22. Cat-tail (Typha latifoUa). Common. 



23. Bur reed (Sparganium eurycarpum). 



24. Water plantain (Alisma subcordatuni) . 



Common. 



25. Wapato (Sagittwria latifolia). Com- 



mon. 



26. Cord-grass (Spartina gracilis). 



27. Reed (Phragmites communis) .* 



28. Big bulrush (Scirpus occidentalis) .* 



Scarce. 



29. Water pepper (Polygonum punctatum). 



Common. 



30. Water smartweed (Polygonum am- 



phihium).* Flowers to mature fruit; 

 common. 



31. Curly dock (Bumex ci'ispus). Sparse. 



32. Water herslock (Cicuta maculata). 



33. Willow aster (Aster salicifoHus) . 



Common. 



SUBMEEGED PLANTS. 



Dominants: 



34. Sago pondweed (Potamogeton pecti- 



natus).* Mature fruit. 



35. Coontail (Ceratophyllum demersum).* 

 Secondary species: 



36. Water moss {Drepanocladus sp.). 



Common. 



37. Bushy pondweed (Najas flexilis). 



Sparse. 



38. Water smartweed (Polygonum amphib- 



ium). Common. 



39. Bladderwort (Vtricularia vulgaris). 



Sparse. 



FLOATING PLANTS. 



42. Water-meal (Wolffla punctata).* 

 dant. 



Abun- 



40. Small duckweed (Lemna minor).* 



41. Star duckweed (Lemna trisulca).* 



Abundant. 



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

 food for wild ducks are : Nos. 21, 28, 34, 35, 37, 40, 41, and 42 ; those of less 

 importance are: Nos. 1, 2, 3, 5 (26), 6, 9, 10, 11, 12, 16 (30, 38), 18, 23, 24, 25, 

 and 29 ; the remainder are of no known value. 



iMr. G. P. Van Eseltine, who identified this specimen, notes that it represents an 

 apparently undescribed form, of which he has seen specimens elsewhere, but which until 

 named may be conveniently classed with its nearest relative, haydeni. 



