140 NATURAL HISTORY BULLETIN. 



Wats, and Cottlt, Gray's Man., 6th ed., 553; Upham, Fl. 

 Minn., 135; Heal and Wheeler, Fl. Mich., 144. 



Floating as little grains on the surface of the water. 



Iowa City and Cedar Rapids, where it is very common 

 some years, Macbride. Shi nick; Mississippi River near Oquaw- 

 ka. 111., Patterson; Muscatine, Reppert. 



TYPHACEiE. 

 TYPHA Linn. Spec. PL, (1753). 



1. T. latifolia Linn. Spec. PI., 971 (1753). 



Wats, and Coult., Gray's Man., 6th ed., 547; Arthur, Fl. Iowa, 

 30; Hitchock, Ames FL, 521 ; Macmillan, Metas. Minn.VaL, 31. 



A well known plant of wide distribution throughout the 

 northern hemisphere. Fertile portion of spike when mature 

 often 1 in. or more in diameter, and 5 to 8 in. long. Common 

 in marshes and edges of ponds. July, August. 



Decorah, Holwayi Iowa City, Macbride; Emmet and Kos- 

 suth counties, Crafty: Ames, Arthur, Hitchcock; Hamilton 

 county, Rolfs; Muscatine, Reppert; Charles City. Arthur; 

 Cedar Rapids, Keokuk, Taylor county. Shi nick: Henry, 

 Scott, Delaware, Jackson counties, Macbride. 



SPARGANIACEiE. 



SPARGANIUM Linn. Spec. PL (1753). 



1. S. simplex Huds. Fl. Angl. Ed. 2, 401 (1762). 



S. simplex Huds. var. nuttallii Englm. in Gray's Man., 

 5th ed., 481 (1867). 



Wats, and Coult., Gray's Man., 6th ed., 548; Arthur, FL Iowa. 

 30; Hitchcock, Ames Fl. 521; Upham. FL Minn., 135. 



Marshes and edges of lakes; rare or local. July. August. 

 Ames, four miles southwest of College. Hitchcock. 



