270 TREES OF MINNESOTA. 
Populus nigra. Black Poplar. 
Leaves broadly triangular, sometimes with tapering or 
rounded base, smaller, less deeply toothed and shorter in propor- 
tion to their width than those of the Cottonwood, which they 
resemble; leaf stock flattened. The tree has generally a pyramidal 
habit of growth and dark foliage. It is less lustrous than the 
Cottonwood, and grows more slowly. This is probably the tree 
known in some localities as Norway Poplar or Norway Cotton- 
wood. What has been sent out under the name of Populus 
betulifolia is probably a form of this species. 
Distribution—Europe and Asia. “It must now, however, 
be regarded as naturalized in this country, having become 
thoroughly established in many localities.” 
Propagation—Almost entirely by cuttings in this country. 
Properties of wood.—L ight, soft, compact, not strong. Specific 
gravity of air-dried wood 0.45. 
4, Uses.—The Black Poplar and its several varie- 
: ties are used for shade and ornamental trees 
where a quick effect is needed. The wood is 
used for cheap packing cases, crates and for light 
fuel. In pharmacy the buds are used for preserv- 
ing fats. 
V arieties.— 
Populus nigra italica. 
Lombardy Poplar. 
A common tree with upright branches, 
making a very straight columnar growth, and 
on this account very conspicuous. Leaves small 
ete ae and generally with a more fapering base than 
Lombardy the species. This is one of the characteristic 
Poplar. trees of Italy. Its common name is derived from 
Lombardy, one of the provinces of Italy. The tree is supposed 
to be a native of Persia and Asia Minor. Its peculiar form gives 
the landscape a crude look where it is much used. Single speci- 
mens, however, may be occasionally planted to advantage to 
give variety to shelter belts. It is hardy in moist soil, and on 
our average prairie soil makes a good growth while young, but 
soon becomes ragged in the top, and loses some of its branches 
and occasionally dies. When it becomes ragged in appearance 
