Z PLANT MATERIAL INTRODUCED 



the experiment station at Ayabe, the experiment station at Okitsu, and several 

 other points which represent named cultivated varieties and several other trees 

 of supposed merit, the whole to be used in studies now being made by Depart- 

 ment specialists. 



Many introductions, about 60 in number, were made to add to the maple 

 collection at the United States Plant Field Station, Glenn Dale, Md., where 

 the genus is the subject of several studies. 



A few miscellaneous introductions appear in this inventory from the special 

 expedition to South America made by C. O. Erlanson and H. G. MacMillan for 

 wild potatoes, the excellent results of which will be recorded in Inventory No. 

 Ill and in subsequent bulletins and papers that will record the successful use 

 of their collected plants in breeding disease-resistant potato varieties. Also 

 related to the general project are the potatoes presented by Dr. V. P. Alekseev 

 (97354-97374), which were developed by him at the Sukhum Subtropical Branch 

 of the All-Union Institute of Plant Industry, Sukhum, Caucasus. 



The botanical determinations have been made and the nomenclature deter- 

 mined by H. C. Skeels, who has had general supervision of this inventory. 



Knowles A. Ryeeson, 

 Principal Horticulturist, in Charge. 



Division of Foreign Plant Introduction, 

 Washington, D. C, June 5, 1933. 



