Complimentary 
NEW SERIES VOL. II 
NO. 3 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN. MASS. MAY 15, 1916 
Flowers in the Arboretum. During the week this Bulletin reaches 
its readers a large number of trees and shrubs will be flowering in the 
Arboretum, including several species of Amelanchier, some of the early 
Honeysuckles, Currants, Gooseberries, Rhododendrons and Viburnums, 
many Willows, the early-flowering Canadian Plum tree, Prunus nigra, 
many of the Asiatic Crabapples, several species of Wild Pears, and 
one or two of the early-flowering species of Lilacs. 
Unfolding leaves. Much is to be learned of trees by the study of 
their unfolding leaves. The color of these and the absence or pres- 
ence of a covering of down may, for some trees like the Lindens, fur- 
nish the best characters for distinguishing related species. This is 
certainly one of the best times of the year for the study of Oak-trees 
and Hickories. The unfolding leaves are often brilliant in color, and 
their hairy covering, when such a covering exists, furnishes a useful 
character for determining such trees. Very beautiful and interesting, 
too, are the very young leaves of the Horsechestnuts. Indeed there 
is not a tree or shrub which, as the leaves unfold, is not capable of 
affording an observing lover of plants much information and the keen- 
est pleasure, and this is a pleasure which can be found in the Arbor- 
etum in a new form every day from the unfolding in early April of 
the leaves of the California Osmaronia cerasiformis and the Chinese 
Prinsepia sinensis to the appearance of those of the Fringe-tree 
(Chionanthus virginica) which remains leafless until after the flowering 
of many shrubs and trees has passed. 
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