TheOlice: The Lilac: Jhe Walnut Family. 273 



THE OLIVE. (Genus Olecf). 



1093. This embraces about thirty-five species, found in tropical 

 Asia and the region bordering upon the Mediterranean. The com- 

 mon European olive (0. Europea) has been long under cultivation 

 in California, but not to considerable extent. 



1094. THE WILD OLIVE of the Southern States (Ovnwilhti* 

 Americana) has about the same ran ire as the live-oak, and is worthy 

 of cultivation as affording some variety, but it does not grow to a 

 large size. 



THE LILAC. (Genus Syringa). 



1095. Of this there are about half a dozen species, natives of 

 Eastern Europe and Asia. They form desirable shrubs for cultiva- 

 tion, on account of the beauty and fragrance of their blossoms, but 

 are of too small size to be important in forest culture. 



THE WALNUT FAMILY. (Jnglamkce). 



1096. This embraces five genera, and some thirty-two species, 

 widely scattered over the northern hemisphere of both continents, 

 and upon mountains within the tropics. The two genera of es- 

 pecial interest are the Carya and Juylans, or the hickories and the 

 walnuts, both of 



which are of the 

 greatest importance 

 as timber-trees, and 

 several of them of' 

 great value for their 

 fruit. 



1097. All of this 

 family yield, when 

 tapped in spring, a 

 sweetish sap, that 

 may be evaporated 

 down to syrup and 



sugar. The amount 143. The Walnut Leaves and Fruit. 



is not, however, sufficient to render it an object, and the injury to 

 the trees would be much greater than any benefit that could be de- 

 rived from this practice. 

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