1^8 NATURAL HISTORY BULLETIN. 



ALISMACEiE. 



ALISMA Linn. Sp. PL (1753). 



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



A. -plantago var. americana, R. and S., Svst. 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, C ratty; Iowa City and Cedar Rapids, Mac- 

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

 Boone, Bcsscv : Muscatine, Reppert; Webster City, Pammcl '; 

 Marshalltown, Stewart ; Hamilton county, Rolfs; Fremont, 

 Washington, Lee, Jackson and Scott counties, Shi/nek. 



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

 1. E. rostratus (JVntt.) Engclui. Gray's Man., 2nd ed., 



438 (1856). 



Aiisma rostrata Nutt. 



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

 Bull. Torr. Bot. Club, XVI., 70. 



Ditches and swamps. Illinois to Iowa and southward: 

 rather rare. August, September. 



Hamburg, Hitchcock; Iowa City, Much ride; Muscatine, 

 Reppert ; Sioux City. Pommel; Keokuk, Shi nick. 



.2 E. parvulus Eno'clm. 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 Iowa, but 

 without locality. 



