IOWA ACADEMY OF SCIENCES. 131 



S. heterophylla Pursh. Winneshiek Co. In shallow water, 

 frequent. 



NAIADACE^E. 



Potamogeton fluitans Roth. Winneshiek, Allamakee, and 

 Clayton Cos. Common in the Upper Iowa river. 

 P. pauciflorus Pursh. Winneshiek Co. Frequent. 



CYPERACE^E. 



Cyperus esculentus L. Clayton Co. Wet ground, frequent. 



Eleocharis palustris R. Br. Winneshiek Co. Wet ground, 

 frequent. 



Scirpus lacustris L. Winneshiek, Allamakee, Clayton, and 

 Dubuque Cos. Wet ground and in water, common. 



S. jiuviatilis Gray. Allamakee Co. Very common in the 

 sloughs of the Mississippi river. 



S. atrovirens Muhl. Winneshiek, Allamakee, and Dubuque 

 Cos. Wet ground, frequent. 



Co rex intumescens Rudge. Dubuque Co. Wet woods, fre- 

 quent. 



C. squarrosa L. Clayton and Dubuque Cos. Wet woods, fre- 

 quent. 



C. hystricina Muhl. Winneshiek Co. Wet ground, fre- 

 quent. 



C. pennsylvanica Lam. Winneshiek Co. Dry soil, com- 

 mon. 



C. stipata Muhl. Winneshiek Co. 



C. vulpinoidea Mx. Winneshiek Co. 



C. rosea Schkuhr. Winneshiek Co. 



C. cephalophora Muhl. Winneshiek Co. 



C. straminea Willd., var. aptera Booth. Winneshiek Co. The 

 same as G. tenera Dew. 



GRAMINEiE. 



Panicum sanguinale L. Winneshiek Co. 

 P. capillare L. Winneshiek Co. 

 P. dichotomum L. Winneshiek Co. 



P. dichotomum L., var. viU.osa Vasey. Winneshiek Co. 

 P. latifolium L. Winneshiek, Allamakee, and Clayton Cos. 

 Woods, frequent. 



