It will be necessary for experimenters to preserve and refer to the Annual 

 Lists of Plant Introductions or to the Inventories published by the Division, for 

 information regarding the plants. Each Inventory lists the seeds and plants imported 

 during a period of three months. Its object is to serve as an historical record; it 

 is not printed immediately following the arrival of the plants, but eighteen to tv>'enty- 

 four months later. The edition is limited, and it cannot be supplied to all experi- 

 menters. This makes essential the preservation of the annual descriptive list as a 

 work of reference, and the Division desires to urge upon its cooperators the import- 

 ance of this step. Unless the Annual lists are preserved, the Division later will 

 be flooded with inquiries from persons who have received plants and who desire in- 

 formation concerning them. Answering such inquiries involves much unnescessary labor 

 and expense. 



For convenience in using the descriptive list, after each description is given 

 in parenthesis the name of the garden or gardens at which the plants are being grown. 



