396 GRASSES OF IOWA. 



abundant in several of our northern counties, are typical representatives 

 of hydrophytes. Leersia or'yzoides and L.lenticularis are semi-hydrophytic 

 grasses, the first in bogs and along bayous throughout the state, the sec- 

 ond along the borders of streams in eastern Iowa, especially the Missis- 

 sippi river. Phragmites vulgaris, a cosmopolitan species, is common in 

 eastern Iowa and in the cold, wet bogs and lakes of the drift area. Spar- 

 tina cynosuroides is less selective than many of the other species; it oc- 

 curs in little valleys or in sloughs, and is mesophytic rather than hydro- 

 phytic, although early in the season it may grow in very moist soil. 



