262 Bulletin No. 205 [March, 



It has been the aim in this investigation to litst all species of grasses 

 which are known to have been collected in the state. Practically all 

 specimens cited here have been seen by the author, and considerable 

 pains have been taken to verify the determinations of the earlier botan- 

 ists whose lists are cited in the bibliography. 



In the preparation of this publication the grasses in the following 

 herbaria have been studied : 



University of Illiriois Herbarium. — The collections in this herbarium 

 have furnished the basis for the work. This herbarium includes partial 

 collections of the earlier botanists Hall, Wolf, Vasey, M. S. Bebb, Mead, 

 and Lapham, with the entire collections of Brendel, Schneck,- Hill, 

 Welsch, and Andrews. The collections of Dr. Welsch were not dated, 

 but are known to have been made between 1862 and 1871. Mrs. Agnes 

 Chase has presented a set of duplicates of her Illinois collections to the 

 University, in addition to many other specimens. There are also du- 

 plicates of most of the species collected by Mr. V. H. Chase of Wady 

 Petra, Illinois, which form an important part of the collection. With 

 a very few exceptions the collections not mentioned in connection with 

 other herbaria belong to the University of Illinois. 



United States National Herbarium. — It was impossible during a 

 brief visit to this herbarium to list all the Illinois specimens there, but 

 only a few of the commoner species were omitted. All the specimens 

 cited as collected by Skeels, Wilcox, and Hill are from this herbarium. 

 There are duplicates of some of these in the Field Museum. 



Field Museum Herbarium. — This herbarium contains a large num- 

 ber of Illinois specimens, and includes the herbarium of H. N. Pat- 

 terson of Oquawka, besides smaller collections made by Sherff, De 

 Selm, and others. 



Northwestern University Herbarium. — The entire collection of 

 H. H. Babcock belongs to this herbarium, together with specimens col- 

 lected by Umbach, Shipman, and Smith. 



Mr. Charles Robertson of Carlinville, Mr. Hallock Shearer of Mt. 

 Carmel, Dr. H. S. Pepoon of Chicago, and Dr. G. H. French of Car- 

 bondale very kindly loaned Illinois specimens for examination, which 

 have aided materially in this work. Some of the species furnished were 

 not found in any of the herbaria examined. 



This work would be quite incomplete without an expression of 

 appreciation for the uniform kindness and many courtesies extended 

 by the curators of these various herbaria. Special thanks are also due 

 Professor William Trelease and Mrs. Agnes Chase for help in the solu- 

 tion of many puzzling problems. 



The accompanying illustrations are all made from original drawings 

 and are designed to show the most typical structure or structures of 

 each species so that its identification will be as easy as possible. Spike- 



