130 IOWA ACADEMY OF SCIENCES. 



L. canadense L. Winneshiek Co. 



Trillium erectum L. Winneshiek Co. Rich woods, frequent. 



T. nivale Riddell. Winneshiek Co. Rocky woods, frequent. 



PONTEDERIACE.^. 



Heteranthera graminea Vahl. Allamakee Co. Frequent in 

 Upper Iowa river. 



COMMELINACE^. 



Tradescantia virginica L. Winneshiek, Allamakee, and 

 Clayton Cos. Rich soil , frequent. 



■ JUNCACE^. 



Juncus tenuis Willd. Winneshiek, Allamakee, Dubuque, 

 and Jackson Cos. Fields snd waysides, common. 



TYPHACE^.. 



Typha latifolia L. Winneshiek and Allamakee Cos. Ponds 

 and river margins, frequent. 



Sparganium eurycarpum Englm. Winneshiek Co. Wet 

 places, frequent. 



ARACE.-E. 



Ariscema triphyllum Torr. Winneshiek, Allamakee, Clay- 

 ton, Dubuque, and Scott Cos. Rich woods, frequent. 



A. dracontium Schott. Winneshiek and Dubuque Cos. Rich 

 woods, infrequent. 



Symplocarpus fcetidus Salisb. Winneshiek and Allamakee 

 Cos. Wet ground, infrequent. 



LEMNACE^. 



Spirodela poly7T7iiza Schleid. Winneshiek and Dubuque Cos. 

 Ponds and river sloughs, common. 



ALISMACE^. 



Alisma plantago L. Winneshiek and Dubuque Cos. Shal- 

 low ponds and ditches, frequent. 



Sagittaria variabilis Engl. Winneshiek, Allamakee, Clay- 

 on, and Dubuque Cos. Mud flats, ditches, and shallow water, 

 common. 



