PLANT INTRODUCTIONS 



Sxpe rimen tsrs will plea se read carefully t his intr oductory 

 note before s ending in their requests for plant materi al . 



This, the Twenty-eighth Annual List of Plant Introductions, contains descrip- 

 tions of many new and rare plants, not yst widely tested in this country. The available 

 inforaation concernins some of them is meager, and it is therefore impossible to speak 

 with assurance regarding their value, their cultural requirements, and their adaptability 

 to the various climates and soils of the United States. 



These plants have been imported because it is believed some direct or indirect 

 use can be made of them. They are first placed at the disposal of the experts engaged 

 in plant breeding, crop acclimatization, and horticultural investigations generally 

 in the United States Department of Agriculture and the State Expariment Stations. 

 Some of them have been grown in sufficient quantity, however, so that they can be 

 distributed to some private experimenters who have the facilities to test them carefully. 

 The List is therefore sent to those who have qualified as experimenters with the Divi- 

 sion of Plant Exploration and Introduction, and who have indicated a willingness to 

 care for material sent them. 



Accompanying this Annual List are complete Check Lists showing all plants avail- 

 able for distribution at the several Plant Introduction Gardens during the season 1933-40 

 and the Garden from which available. Applicants for material should fill out all blanks 

 at the top of the Check List of each garden fiom which they request plants, place a 

 mark to the left of the P. I. (Plant Introduction) number of each plant desired, and 

 return the lists promptly to this Division. Items marked with an asterisk (*) are 

 available in somewhat larger numbers, for propagating purposes, to interested nurserymen 

 having exceptional facilities. 



It should be distinctly understood that the Division does not agree to supply 

 all the plants requested. It reserves the right to limit the number or to withhold 

 the entire request of any experimenter in order that it may place the material according 

 to its best judgment. 



The shipping season extends, as a rule, from December 1 to April i. While it 

 may not always be practicable to ship plants at the time preferred by experimenters, 

 it is much desired that when such preference exists it be indicated in the space provided 

 for it at the head of the Check List. 



Th3se pla nts are plac ed in the hands of experimenters wilh th e und erstanding 

 ili§i re ports on their behavior will be sent to this Division from time to time, par- 

 ticularly noting their flowering, fruiting, hardiness, utilization, and any other 

 interesting features. Reports should be prepared (preferably, but not necessarily, on 

 regular forms) ana sent, witho ut sgscial request , whenever in the judgment of the 

 experimenter the plant has reached a stage that makes a report worth while; usually, 

 however, unless the plant has flowered or died, reports should not be made within the 

 first year or two. Regular report forms will be furnished by this Division, upon 

 request. When all the plants of any P.I. number have died, this should be reported 

 promptly by letter, with the cause of death indicated when known. It is exgect^d that 

 experimenters will keep their EiaHiS labeled at all tiinesj. and keep accurate charts 

 sho wing the location and P , T . number of each one^ Failure jto comply with these direc- 

 tions will be considered sufficient reason for a di scontin ua nc e of th e cooperative 

 relation. 



