316 



NATURAL HISTORY BULLETIN. 



Of the species herein listed 15 are annuals, divided among 

 the genera as follows: Cyperus, 7; Eleocharis, 4; Steno- 

 i>hyllus, 1 ; Fimbristylis, 1 ; Stir fits, 1 ; and Hemicarpha, 1, 

 The remainir g species of these and all the other genera are 

 perennials. 



The classification followed is that of Britton and Brown's 

 Illustrated Flora (1896-7). The names used in Gray's 

 Manual, 6th edition, and in previously published lists, when 

 different, are given in the synonymy. In this order, however, 

 the changes made are comparatively few. 



In the study of the material at my command I have been 

 greatly aided by having access to several sets of plants deter- 

 mined by Prof. L. H. Bailey, of Cornell University, Ithaca, 

 New York, and by Dr. N. L. Britton, of Columbia Univer- 

 sity, New York City. The former gentleman has at various 

 times greatly aided me by the determination of carices and 

 by the exchange of specimens. 



My thanks are also here tendered to the following persons 

 for specimens and other assistance: Prof. B. Shimek, of the 

 Iowa State University for collections made in various parts of 

 the state; Prof. Bruce Fink, of Upper Iowa University, at 

 Fayette, for a set of the sedges of that region; Prof. L. H. 

 Pammel, of the Iowa Agricultural College, for the privilege 

 of studying the Cyperacece in the herbarium of that institution, 

 for extensive collections made in various parts of the state, 

 and for the loan of literature; Messrs. Wm. D. Barnes, of 

 Blue Grass, and A. A. Miller, of Eldridge, Scott County, two 

 most excellent collectors, for sedges from that region and for 

 many valuable notes regarding soil, distribution, etc.; Prof. 

 T. J. Fitzpatrick, of Graceland College, Lamoni. for speci- 

 mens from Decatur County and from other localities; Prof. 

 H. W. Norris and Frank W. Johnson, of Iowa College, 

 Grinnell, for the loan of their private collections and a portion 

 of the college herbarium; Dr. J. C. Arthur, of Purdue Univer- 

 sity, Lafayette, Indiana, for data and the loan of specimens; 

 Prof. T. H. Baldwin, of Tabor, Iowa, for specimens of his 

 own collection and a list of the sedges, with the accompany- 



