4 INTRODUCTORY. 



A. Sirrine, Jamaica, N. Y.; Prof. E. E, Kaufman, Fargo, N. 

 D.; Prof. G. W. Carver, Tuskeegee, Ala.; F. Reppert, Musca- 

 tine; Prof. C. E. Bessey, Lincoln, Neb.; Bandusia Wakefield, 

 Sioux City; A. A. Miller, Davenport; W. D. Barnes, Blue 

 Grass; C. A. Wilson, J. I. Schulte, C. R. Ball, W. E. Gossard, 

 C. O. Pool, W. Newell, Charles Le Buhn, A. F. Sample, J. H. 

 Rolfs, Emma Sirrine, C. B. Weaver, B. H. Hibbard, H. C. Tay- 

 lor, A. P. Whitmore, W. H. Warden, C. E. Eckles, Miss A. 

 Estella Paddock, H. H. Hume, C. A. Battles, H. A. Crawford, 

 W. D. Fitzwater, H. O. Sampson, Geo. F. Sokol, E.R. Hodson, 

 L. R. Walker and other students of the Agricultural College. 

 Specimens sent from F. Reppert of Muscatine, W. D. Barnes 

 of Blue Grass, A. A. Miller of Davenport, J. H. Mills of Mount 

 Pleasant, R. I. Cratty of Armstrong, and B. Fink of Fayette, 

 are especially worthy of mention. Several local species are 

 found in the vicinity of Muscatine and Davenport which do 

 not occur elsewhere in the state. We wish also to express our 

 special thanks to Prof. T. H. Macbride and B. Shimek of the 

 State University of Iowa. The latter has not only favored us 

 with specimens, but has gone through the entire collection of 

 the State University and listed such as were determined by 

 Professor Lamson-Scribner. We wish also to express thanks 

 for uniform courtesy shown us by the Division of Agrostology 

 of the United States Department of Agriculture. We are also 

 indebted to Dr. William Trelease of the Missouri Botanical 

 Garden for the use of books, to Dr. Robinson of Gray Herbar- 

 ium of Harvard University for having kindly looked up the 

 specimens referred to in Gray's Manual, sixth edition; to Dr. 

 Harshberger of the University of Pennsylvania for the speci- 

 mens of Zea canina and its hybrids with Euchlaena; Prof. G. W. 

 Carver for help on fungus diseases of grasses, and Dr. H. Fos- 

 ter Bain and Dr. Calvin, who encouraged the work in every 

 way. We wish also to express our thanks to the agricultural 

 press of this state, which has kindly assisted us in every way 

 possible in making a complete collection of our grasses. 

 Special mention should be made of the volunteer observers of 

 the Iowa State Weather Service, who have in every way assisted 

 us. Their notes and specimens have been of much value to us. 

 Special thanks are also due to Miss Emma Sirrine, Dr. H. Fos- 

 ter Bain, Dr. S. Calvin; to C. R. Ball, and R. Combs, who assisted 

 In preparing the bibliography; to Dr. S. W. Beyer, who made 

 most of the photographs; C. B. Weaver and several students, 



