College, in particular the excellent grass herbarium, were invaluable. 

 Dr. H. E. Jaques, the editor of the Pictured-Key Nature Series, has been 

 constantly helpful. The keys have been tested repeatedly by the au- 

 thor's students, and for their cooperation he extends his heartfelt thanks. 



Ames, Iowa 

 October, 1953 



(^..JLc^JL). Tfc^ 



The Grass Family ranks near the top of the plant kingdom in 

 the number of species it contains. No other group of plants figures 

 so prominently in furnishing us with food. To know a good number 

 of grasses is a cultural obligation as well as a source of personal 

 satisfaction. 



Dr. Pohl's keys and illustrations are the result of years of study 

 and work with these interesting plants. His book is well worthy of a 

 place in the Pictured-Key Nature Series and in the library of every 

 plant lover. 



Editor 



