IOWA ACADEMY OP SCIENCES. 
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J. torreyi Coville. Fremont county. Damp soil; frequent. 
Typhace^. 
TypJia latifolia L. Union^ Adams^ Page^ and Fremont coun- 
ties. Margins of ponds; frequent. 
Sparganium eurycarpum Englm. Ringgold county. Ponds ; 
frequent. 
S. androcladum (Englm.) Morong. Ringgold county. Ponds; 
frequent. 
Arace^. 
Arismma triphyllum Tor. Pottawattamie county. Rich ■ 
woods; common. 
A, dracontium Schoot. Union^ Page, and Pottawattamie 
counties. Rich woods; frequent. 
Lemnace^. 
Spirodela polyrrhiza 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^. 
Alisma plantago L. Ringgold county. Moist places; fre- 
quent. 
Sagittaria variaMlis Engl. Ringgold and Taylor counties. 
Ponds; common. 
S. graminea Mx. Fremont county. Common in mud flats or 
shallow water. 
Naiadace^. 
Potamogeton fluitans Roth. Common in Wabonsie slough. 
Cyperace^. 
Gyperm speciosus Vahl. Ringgold county. 
C. esculentus L. Montgomery and Fremont counties. 
Meocharis 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. 
