157 



25. S. simplex Huds. 



Not rare in a few swamps, quite local, however. 



26. Potamogeton nataiis L. Common Floating Pondweed. 



Abundant in shallow water. Eagle Lake. 



27. P. amplifolius Tuclierm. Long-leaved Pondweed. 



In patcnes, common. Eagle Lake. 



28. P. lonchites. (P. fluitans Roth.) 



Common in the lake, especially near outlets and inlets. 



29. P. luceus L. Shining Pondweed. 



Abundant in the lake. 

 SO. P. pert'oliatus. 



Quite plentiful in Eagle Lake. 



31. P. zosteraefolius Schum. Eel Crass Pondweed. 



Abundant. 



32. P. pusillus L. Small Pondweed. 



Only a few specimens seen. 



33. P. pectinatus L. Fennel-leaved Pondweed. 



One of the most common and widely distributed. 



34. Naias flexilis (Willd.) Rost and Schmidt. 



Quite abundant in shallow water, sometimes forming exten- 

 sive carpets. 



35. Triglochin palustris L. Marsh Arrow Grass. 



In a swamp south of the lake about a half mile. 



36. Alisma plantago aquatica L. Water Plantain. 



Abundant in moist places. 



37. Sagittaria engelmanniana J. G. Smith. (S. variabilis gracilis Engelm.) 



A few plants along the shore of Eagle Lake in lagoons. 



38. S. iatifolla Willd. Broad-leaved Arrowhead. (S. variabilis Engelm.) 



Quite abundant, especially on the southern lake plain. 



39. S. rigida Pursh. (S. heterophylla pursh.) 



A few plants noted in shallow water. 



40. S. gi'aminea Michx. Grass-leaved Arrowhead. 



At the Laboratory bayou. 



41. Philotria canadensis (Michx.) Britton. Ditch Moss. (Elodea cana- 



densis Michx.) 



In bayous and cut-offs; veiy little found in the lake itself. 



42. Vallisneria spiralis L. Tape-grass. Eelgras.s. 



In patches, scattered, not abundant in Eagle Lake. 



