BULLETIN NO. 34. 
To the general rule that the leaves of European trees are not 
brilliantly colored in the autumn in comparison with those of eastern 
North American and eastern Asiatic trees of the same genera there 
are a few exceptions. The most conspicuous of these exceptions is 
perhaps found in the so-called Norway Maple ( Acer platanoides), a large 
tree of northern and central Europe which has been much planted in 
the northern and middle states where it succeeds better than most 
European trees. This tree almost equals the native Sugar Maple in the 
bright clear yellow tints of its fading leaves which do not take on their 
greatest beauty until after those of the Sugar Maple have mostly 
fallen. This tree is very beautiful, too, in the early spring when the 
leafless branches are covered with dense clusters of bright yellow 
flowers. In cultivation a number of seedling forms of this tree have 
been developed and many of the most important of these are estab- 
lished in the Maple Group. The best known of these horticultural 
varieties is the form with purple leaves (var. Schwedleri) which has 
been often planted in this country. The leaves of this form are deep 
reddish purple early in spring, but their color is not persistent and 
nearly disappears before midsummer, leaving the leaves a dull shade of 
green. The var. globosum is a broad shrub only a few feet high and 
one of the most valuable of all the dwarf Maples. There is an unus- 
ually fine specimen of this form in the collection. The var. columnar e 
is a pyramidal tree with erect branches, and the var. nanum , some- 
times known in gardens as Acer platanoides pyramidale nanum, is 
dwarfer than the last mentioned variety and is an attractive and useful 
plant for small gardens. There are several forms of this tree with 
deeply divided or otherwise abnormal leaves. Some of these are var. 
laciniatum, the Eagle-Claw Maple, var. cucullatum and var. palmatum. 
The American Horsechestnuts lose their leaves early and without 
much change of color, although occasionally those of the Ohio Buckeye 
(. Aesculus glabra ), when the tree is grown under exceedingly good 
conditions, turn bright red early in October. The tree from the south 
of Greece, however, the familiar and common Horsechestnut of parks 
and gardens and one of the most splendid of all hardy trees holds its 
leaves later than any of the American species, and on trees grown in 
damp moist soil they are only now beginning to fall after having 
turned bright yellow. 
The American Lindens have now lost their leaves, but those of one 
species from western Europe, Tilia petiolaris, are only just falling, 
having first turned bright yellow. This is a handsome tree with rather 
pendulous branches and leaves which are silvery white on their lower 
surface and hang on long drooping stalks. This is not a very common 
tree in the neighborhood of Boston but it was largely planted on many 
estates in Newport, Rhode Island, from fifty to seventy years ago and 
some of these Newport trees have grown into beautiful specimens. 
The three European Oaks which are usually cultivated in the eastern 
United States, Quercus pedunculata , Q. sessilijlora, and Q. Cerris, the 
