82 
and shrubs which we do not have and which it is especially desir- 
able that we should have. With Mr. lree, I visited the Hodenpy! 
estate at Locust Valley, and later the extensive nursery of the 
Boyce Thompson Arboretum, 
Plant Families 
With assistance supplied by the Emergency Work Bureau, a 
preliminary English translation, afterwards typewritten, was made 
of a large part of the Engler-Gilg Syllabus, 9-10 edition. Maps 
were made of the world distribution of various families. 
Nomenclature 
In cooperation with Mr. Alfred) Rehder, of the Arnold 
Arboretum, I am preparing a list of species of hardy trees and 
shrubs, based on Rehder’s Manual, indicating the differences in 
nomenclature in the following publications : 
H: Hortus, 1930 S: Standardized Plant Names, 
K: Kew Hand List of Trees 1923 
and Shrubs, 1925 Z: Zander Pflanzennamen, 
R: Rehder’s Manual, 1927 1927 
As an example the differences for the genus Acer (maple) are 
given: 
Acer 
ambiguuim IK: pictium HR 
creticum IK Z: orientale HR 
dasyeoarpum KS: saccharinum HR 
lactum Z: cappadocicum H R 
neglectuim Ke: Zoeschense lk 
obtusatum Z: Opalus HR 
polymorphum Z: coriaceum R 
purpurascens K: diabolicum He 
striatum ys : pe MNS Iz anid WIL i. R 
tauricum Z: hyrcanum HR 
trifidum Ko: Buc rgel ianum HR 
ukurunduense IK: caudatum TH IR 
When these differences in standard publications are extended to 
the number of genera in cultivation, an idea is obtained of how far 
