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LANDSCAPE GARDENING. 
an enormous tree of the swamps of the south and westj 
considerably resembling the Cotton tree, but without the 
resinous buds of that species. 
Among the European kinds, the most ornamental, as we 
have already remarked, is the Silver aspen, White poplar, or 
Abele tree ( P . alba), which grows to a great size on a deep 
loamy soil in a very short time. The leaves are divided 
into lobes, and toothed on the margin, smooth and very 
deep green above, and densely covered with a soft, close, 
white down beneath. There are some varieties of this 
species known abroad, with leaves more or less downy, etc. 
Sir J. E. Smith remarks in his English Flora, that the wood, 
though but little used, is much firmer than that of any other 
British poplar ; making as handsome floors as the best 
Norway fir, with the additional advantage that they will 
not readily take fire, like any resinous wood. 
The English aspen (P. tremula) considerably resembles 
our native aspen ; but the buds are somewhat gummy. 
The Athenian poplar (P. Grceca) is a tree about 40 feet 
high, with smaller, more rounded, and equally serrated 
foliage. The common Black European poplar (P. nigra) 
is also a large, rapidly growing tree, with pale-green leaves 
slightly notched: the buds expand later than most other 
poplars, and the young leaves are at first somewhat reddish 
in color. The Necklace-bearing poplar (P. monilifera), sc 
called from the circumstance of the catkins being arranged 
somewhat like beads in a necklace, is supposed to have 
been derived from Canada, but there are some doubts 
respecting its origin : in the south it is generally called the 
Virginia poplar. 
The Lombardy poplar (P. dilatata), a native of the banks 
of the Po, where it is sometimes called the Cypress poplar 
