Complimentary 
NEW SERIES VOL. VI 
NO. II 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN. MASS. JULY 1. 1920 
Lindens. So far as flowers are concerned the interesting trees in the 
Arboretum in July are the Lindens of which there is a large and well es- 
tablished collection in the meadow on the right-hand side of the Meadow 
Road. Linden-trees are found in eastern North America, eastern Asia, 
the Caucasus, and in Europe, and the species are usually widely dis- 
tributed and common forest trees. All the species are quite similar in 
the character of their flowers and fruit, and chiefly differ in the shape 
of their leaves, in the presence or absence of hairs on the leaves and 
branchlets and in the nature of this hairy covering when it exists. A 
curious fact about Linden-trees is that in the flowers of the American 
species there are five petal-like scales opposite the petals and connected 
with the clusters of stamens, and that in the flowers of the Old World 
Linden-trees these petal-like scales do not occur. Another interesting 
fact which has been learned here about Linden-trees is that in the 
Arboretum the European species and their hybrids are more vigorous 
and handsomer trees than the Asiatic species, although with few other 
exceptions eastern Asiatic trees give more satisfaction in eastern North 
America than the trees of western Europe. The European Lindens, 
too, grow more rapidly than the American species which have never 
been very generally planted in this part of the country, with the ex- 
ception perhaps of the northern Tilia glabra which oftens suffers here 
in dry summers from the attacks of the red spider which disfigures 
and often causes the leaves to fall in August, especially when it is 
planted as a street tree. This tree usually appears in books under the 
incorrect name of Tilia americana. It is a splendid tree in the forests 
of northern New England and eastern Canada, where it is found from 
northern New Brunswick to the shores of Lake Winnipeg, and is less 
common and of smaller size southward. The leaves are destitute of 
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