VI PREFACE 



tain Botany and Britton's Manual, Chapman's Flora of 

 the Southern States, Small's Flora of the Southern States 

 and a Flora of California soon to be issued by Professor 

 Jepson. 



The chapters on eradication of weeds, how weeds are 

 disseminated, the farmer's interest in good seed, as well 

 as the method of weed propagation, should be of special 

 interest to the farmer. The illustrations should be help- 

 ful to those who are not familiar with the technical terms 

 used in the descriptions of plants. Some of the figures 

 were drawn by Miss Charlotte M. King, generally not 

 indicated except by her initials, others by Miss Ada Hay- 

 den, all indicated except figures redrawn from other 

 sources. To both I express my thanks for the artistic 

 sketches. Many of the remaining figures have been taken 

 from publications of the United States Department of 

 Agriculture and the Iowa Agricultural Experiment Sta- 

 tion. Credit has been given in every case. I am also 

 greatly indebted to Miss Harriette S. Kellogg for the 

 preparation of the bibliography, index, the reading of the 

 manuscript and proof. 



L. H. PAMMEL. 

 Ames, Iowa. 

 April 5, 1911. 



