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pink blossoms make of it a graceful and charming object 
Near the eastern end of the long bridge are trees illustrat- 
ing the senna family, located south of the bridge approach, 
and the pea family, the true family and the mahogany 
family on the north side. One of those in the senna family 
is the honey-locust or three-horned acacia (Gleditsia), a 
native of the southeastern United States; its durability 
when in contact with the ground makes its wood of es- 
pecial value for fence posts, for which purpose it is largely 
used; from China and Japan comes the Japanese locust, 
also represented here. Another of this family is the 
Kentucky coffee-tree, in several large and small specimens. 
One of the representatives of the pea family, from the 
Amur region, is the Amur yellow-wood (Maackia). An- 
other is the locust-tree (Robinia), a native of the south- 
eastern United States, but extensively naturalized else- 
where; its wood is ie and close-grained, and is very 
durable when in contact with ground or with water, so the 
high value in which it is held for fence posts and for ship- 
building may be readily understood. The rue family 
has for representatives the Japanese cork-tree (Phelloden- 
dron), from Japan, and the Asiatic or Sachalin cork-tree, 
from northeastern Asia. The mahogany-tree family has 
a single species represented, the Chinese bastard-cedar, a 
native of China; the mahogany tree itself, and other repre- 
sentatives of the family, will be found at the conservatories. 
On the ridge to the northeast of the apple family, and to 
the west of conservatory range No. 2, are trees of the ailan- 
thus family, represented by the Ailanthus, or tree-of- 
heaven, a native of China, but extensively naturalized in 
the eastern parts of the United States, where in some places 
it has become a nuisance, both on account of its ill-smelling 
staminate flowers and its habit of freely suckering from 
the roots. 
On the ridge to the west of conservatory range No. 2 are 
representatives of the maple family. The maples (Acer) are 
represented by a number of species. Perhaps the most im- 
