PLANT INTRODUCTIONS 

 Experimenters will please read carefully this introductory 



note before sending ill their requests for plan t material. 



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

 tions of many new and rare plants, not yet widely tested in this country. The avail- 

 able information concerning 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 Experiment Stations, 

 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 care- 

 fully. The List is therefore sent to those who have qualified as experimenters with 

 the Division of Plant Exploration and Introduction, and who have indicated a willing- 

 ness to care for material sent them. 



Accompanying this Annual List are complete Check Lists showing all plants 

 available for distribution at the several Plant Introduction Gardens during the season 

 1940-41 and the Garden from which available. Applicants for material should fill out 

 all blanks at the top of the Check List of each garden from 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 1. 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. 



These plants are placed in the hands of experimenters with the und e rstand ing 

 that reports on the ir 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) and sent, without sp ecia l 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, rt is expected that 

 ^2£E®riS§2.i§X§ will kee_2 jtheir p lants labeled at all times_,_ and keep accurate charts 

 sho wing the location and P.I . number of each one . Failure to comply with these 

 directions will be considered sufficient reason for a discont inuanc e of the c oopera - 

 tive relation. 



