EXPLANATORY NOTE 
This circular is made up principally of notes re- 
ceived from agricultural explorers , foreign collabora- 
tors, and correspondents, concerning the more import- 
ant plants which have been received recently by the 
Office of Foreign Seed , and Plant Introduction. It 
also contains reports on the behavior in the United 
States of plants which have been introduced in pre- 
vious years. 
Descriptions appearing in Plant Immigrants are 
revised and published later in the Inventory of Seeds 
and Plants Imported, --the permanent, record of plant 
introductions made by this Office, 
Plant Immigrants should be considered an ANNOUNCE-^ 
MENT OF THE ARRIVAL OF PLANT MATERIAL. With the excep- 
tion of seeds received in quantity, all material must 
be propagated before it is available for experimenters 
who desire to test it. This requires one to four years , 
depending upon the plant and the quantity of propaga- 
ting material imported. 
The Annual Catalogue of New Plant Introductions, 
issued in the autumn, describes briefly the plants 
which are ready for distribution.- Applications for 
seeds or plants listed in Plant Immigrants may be sent 
at any time , however, and will be filed in the order of 
their receipt. 1 When material is ready for distribu- 
tion, these requests will first be given attention; 
if their number is . sufficient to exhaust the available 
supply of a given species, it will not be included in 
the Annual Catalogue . 
One of the objects of the Office of Foreign Seed 
and Plant Introduction is to secure experimental quan- 
tities of new or rare foreign seeds or plants for 
plant breeders and experimenters, and every effort 
will be made to fill specific requests. 
DAVID FAIRCHILD, 
Agricultural Explorer in Charge, 
Office of Foreign Seed and Plant Introduction. 
Issued April 15, 1922. 
Any one, desiring to republish any portion of this 
circular should obtain permission by applying to 
this Office, 
