IOWA ACADEMY OF SCIENCES. ]99 



J. torreyi Coville. Fremont county. Damp soil; frequent. 

 Typhace^. 



Typha latifolia L. Union, Adams, Page, and Fremont covm- 

 ties. Margins of ponds; frequent. 



Sparganium eurycarpum 'EnglvQ.. Ringgold county. Ponds; 

 frequent. 



S. anclrocladum(Englm..)Morong. Ringgold county. Ponds; 

 frequent. 



Arace^. 



Ariscema triphyllum Tor. Pottawattamie county. Rich 

 woods; common. 



A. dracontium Schoot. Union, Page, and Pottawattamie 

 counties. Rich woods; frequent. 



LemnaceyE. 



Spirodela polijrrJiiza Schleid. Fremont county. Ponds and 

 sloughs; common. 



Lemna trisulca L. Fremont county. Ponds and sloughs; 

 frequent. 



L. minor L. Decatur, Taylor, and Page counties. Ponds 

 and streams; frequent. 



Alismace^. 



Allsma plantago L. Ringgold county. Moist places; fre- 

 quent. 



Saglttaria variabilis Engl. Ringgold and Taylor counties. 

 Ponds; common. 



S. graininea Mx. Fremont county. Common in mud flats or 

 shallow water. 



Naiadace^. 



Potamogeton fluitans Roth. Common in Wabonsie slough. 

 Cyperace^. 



Cyperus speciosus Vahl. Ringgold county. 



C. escidentus L. Montgomery and Fremont counties. 



Eleocharis ovata R. Br. Ringgold county. 



E. acicularis R. Br. Fremont county. Margins of ponds; 

 common. 



Scirpus lacustris L. Fremont county. Ponds; common. 



*S'. fluviatilis Gray. Decatur county. Frequent in one 

 locality. 



