Complimentary 
NEW SERIES VOL. IV 
NO. 9 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. JUNE 20, 1918 
Populus Maximowiczii. This tree is a native of eastern Siberia, 
eastern Saghalin and northern Japan. It is the largest tree of east- 
ern Siberia where it sometimes grows eighty feet high with a trunk 
six feet in diameter and a broad head of massive spreading branches. 
On young trees the bark of the trunk is smooth and pale brown, but 
on old trees it becomes thick and furrowed. This Poplar was first 
sent to the Arboretum from Petrograd in 1878 but its distinctive char- 
acters were not recognized until some years later. The plants now in 
the Arboretum were propagated from the Petrograd tree which disap- 
peared when the Poplar Collection was rearranged on the southern 
slope of Bussey Hill. They are now twenty years old and about thirty- 
five feet high. They have never been attacked by borers which make 
the cultivation of the Balsam Poplars and some of the Cottonwoods so 
difficult and unsatisfactory, and their leaves apparently have no attrac- 
tion for leaf-eating caterpillars. The leaves are green and lustrous 
on the upper surface, silvery white below, three or four inches long, 
and two or two and a half inches wide. The fruit, which is fully 
grown in May, unlike that of other Poplars, remains on the trees here 
until September without opening. 
Native and Foreign Trees. Populus Maximowiczii is not only the 
handsomest and most satisfactory tree in the Poplar Collection but it 
is one of the few large exotic trees with deciduous leaves which can be 
recommended for general planting in the northern states. For the list 
of such trees is a short one. It includes the Gingko, which stands alone 
in its class and is one of the great trees of the world. The only sur- 
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