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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, from the Himalayan region; the Cham- 

 lagu pea-tree, from China; the common pea-tree and the 

 small-leaved pea-tree, both from Siberia. The white 

 broom, the common broom and the dense-flowered broom 

 all of Europe, have representatives here; of these, the 

 common broom, 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 common name. Other plants 

 of interest are the false indigo and the bristly locust and 

 Kelsey's locust, all from the southeastern United States; 

 the woody bladder-senna, from Europe and the Orient; 

 and the scorpion senna, from southern Europe. Immed- 

 iately beyond is the rue family, illustrated by the shrubby 

 trefoil {Ptelea trifoliata) of the eastern United States; the 

 prickly ash, from the northeastern United States, and 

 Bunge's prickly ash, from China, and the anise pepper 

 tree, of the same genus, from China and Japan; and the tri- 

 foliolate orange, from Japan, 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 the conservatories, together with other woody 

 members of this family. The tanners'-tree family comes 

 next with a single representative from Japan. 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 hardness and close fine grain, and it takes a fine pol- 

 ish. A few steps further on is the sumac family, to which 

 belongs the common poison ivy, so frequent in and around 

 New York City; here are the fragrant sumac, the mountain 

 sumac and the smooth or scarlet sumac, all from the eastern 

 United States; Osbeck's sumac is a stately shrub from 



