Complimentary 
NEW SERIES VOL 111 
NO. 15 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. OCTOBER 23, 1917 
The brilliant autumn coloring of the leaves and the abundant and 
handsome fruits of many trees and shrubs are conspicuous features in 
the floras of eastern North America and eastern Asia, and as there 
are larger collections of these plants in the Arboretum than in other 
gardens this is the best place to study trees and shrubs with refer- 
ence to the autumn decoration of parks and gardens in our north- 
eastern states. Bright autumn colors can be seen in the Arboretum 
from the middle of September until the middle of November, or even 
later in exceptional years. Handsome fruits begin to ripen here in 
July and on some plants they retain their brilliancy until late spring. 
In Japan the great autumn color effects are in November or a month 
later than in our northern states, for in Japan the Maples, which are 
perhaps the most brightly colored of the Japanese trees, take on their 
autumn colors very late, as they do when transplanted to this country. 
The leaves of several eastern Asiatic trees change color and fall early. 
Some of these are Phellodendron amurense, Acer ginnala, Acer mand- 
shuricum, and Evonymus alatus. 
Phellodendron amurense. This is a small tree from the Amoor 
region of eastern Siberia. It is chiefly interesting as the type of a 
small genus with a few species of trees of eastern Asia of the Rue 
Family, and for its peculiar thick, ridged, pale cork-like bark. Early 
in October the leaves turn to a bright clear yellow which is hardly 
equalled in beauty by the yellow of the autumn leaves of any other 
tree. Unfortunately this beauty is short-lived and the branches are 
already bare. 
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