148 NATURAL HISTORY BULLETIN. 



ALISMACEiE. 



ALISMA Linn. Sp. PI. (1753). 



1. A. plantago Linn. Sp. PL, 342 (1753). 



A. plantatw var. americana, R. and S., Syst. III. (1818). 



Wats, and Coult., Gray's Man., 6th ed., 554; Arthur, Fl. 

 Iowa, 31; Hitchcock, Ames FL, 522; Upham, Fl. Minn., 138. 



Common throughout the State. The plant varies greatly, 

 especially in regard to size and foliage, the result of different 

 conditions of its place of growth. June, July. 



Emmet county, Cratty ; Iowa City and Cedar Rapids, Mac- 

 bride; Decorah, Holway ; Ames and Charles City, Arthur: 

 Boone, Ressey ; Muscatine, Reppert; Webster City, Pammel; 

 Marshalltown, Stewart; Hamilton county, Rolfs; Fremont, 

 Washington, Lee, Jackson and Scott counties, Shinick. 



ECHINODORUS Richard. Mem. Mus., 365 (1815) 

 1. E. rostratus (JVutl.) Engelm. Gray's Man., 2nd ed., 



438 (i8 5 6). 



Alisma rostrata Nutt. 



Wats, and Coult., Gray's Man., 6th ed., 556; Hitchcock, 

 Bull. Torr. Bot. Club, XVL, 70. 



Ditches and swamps. Illinois to Iowa and southward; 

 rather rare. August, September. 



Hamburg, Hitchcock; Iowa City, Macbridc; Muscatine, 

 Reppcrt; Sioux City, Pammel '; Keokuk, Shimck. 



.2 E. parvulus E noxlm. Gray's Man., 2nd ed., 438 (1856). 



Wats, and Coult., Gray's Man., 6th ed., 556; Arthur, FL 

 Iowa, 31; Upham, Fl. Minn., 138; Beal and Wheeler, Fl. 

 Mich., 145. 



Rare or local. No. 786 of Arthur's Flora of lozva, but 

 without locality. 



