EUCALYPTUS TREES. 237 
Europe and Middle Asia. One of the grandest trees 
for lining roads and for street planting, deciduous 
like the other planes, rather quick of growth, and not 
requiring much water; attains a height of ninety 
feet. The wood is well adapted for furniture and 
other kinds of cabinet work. 
Platanus racemosa, Nuttall.—The California Plane- 
tree. Wood harder and thus more durable than that 
of P. occidentalis, also less liable to warp. 
Populus alba, L.—The Abele or White Poplar of 
Europe and Middle Asia. Height ninety feet. It 
proved here an excellent avenue tree, even in com- 
paratively waterless situations, and gives, by the par- 
tial whiteness of its foliage, a pleasing effect in any 
plantation. Populus canescens, Sm., the gray Poplar, 
is either a variety of the Abele or its hybrid with the 
Aspen, and yields a better timber for carpenters and 
millwrights. ' 
Populus balsamifera, L.—The Hackmatack (Tam- 
arack) or Balsam Poplar, of the colder, but not the 
coldest parts of North America, eighty feet high. 
Its variety is P. candicans, Aiton. / 
Populus grandidentata, Michaux.—North America, 
sixty feet high. A kind of aspen. 
Populus heterophylla, L. — The downy Poplar of 
North America. Height sixty feet. 
Populus monilifera, Aiton. (P. Canadensis, Desf.) 
—The Cotton wood-tree of North America. Height one 
hundred feet. Oneof the best poplars for the produc- 
tion of timber. 
Populus nigra, L,—The European Black Poplar, 
extending spontaneously to China. It includes Popu- 
lus dilatata, Aiton, or asa contracted variety, P. fasti- 
