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senna family, represented by the Asiatic red-bud, of 
China and Japan, and the American Judas-tree of the 
eastern United States; in spring, before the appearance of 
the leaves, these are profusely covered with pink or pur- 
plish flowers. Across the transverse driveway to the 
north, and directly on the opposite side, may be found the 
pea family. Here are various species of the pea-tree: 
the pigmy pea-tree, ranging from the Caucasus to Siberia 
and Thibet; the Chamlagu pea-tree, from northern China; 
the Chinese pea-tree; and the small-leaved pea-tree. The 
Scotch broom and the dense-flowered broom, of Europe, have 
representatives here; of these, the former, in Spain and 
France attains the size of a small tree, and its wood is 
highly prized for veneering and cabinet work; its branches 
are extensively employed for making brooms, whence its 
commen name. Other plants of interest are the false 
indigo, the rose acacia, and Kelsey’s rose acacia, all 
from the Southeastern United States; the tall bladder- 
senna, from southern Europe and northern Africa; and 
the scorpion senna, from southern Europe. Immed- 
iately beyond is the rue family, illustrated by the hop tree 
(Ptelea trifoliata) of the eastern United States; the prickly 
ash, from the northeastern United States, Bunge’s 
prickly ash, from China, and the Japanese prickly ash 
from Japan and Korea; the trifoliolate orange, from 
northern China, which has been used as one of the 
parents in the recent hybridization experiments by the 
U. S. Department of Agriculture in its effort to produce a 
more hardy orange; the lemon and forms of the orange may 
be found in conservatory range 2, together with other woody 
members of this family. Following this is the box family, 
represented by a number of forms of the box-tree, from 
Europe, Asia and Japan; the wood of the box-tree is 
highly prized for wood-engraving, on account of its hard- 
ness and close fine grain, and it takes a fine polish. A 
few steps farther on is the sumac family, to which be- 
longs the common poison ivy, so frequent in and around 
