420 



BOTANY 



shrubs, and some herbaceous plants, and includes many tropical trees, some of 

 great economic importance. The most important genus is Ficus, to which 

 belong the common Fig (Ficus carica) (Fig. 402), the India-rubber tree (F. 

 elastica), and the various Banyan trees (F. religiosa, etc.). The Hop (Humulus 

 lupulus) and the Hemp ( Cannabis sativa) are also members of the Moracese. 



Order X. Proteales 



The Proteales include the single large family Proteacese, mostly shrubs or 

 trees of the southern hemisphere, being especially abundant in Australia and 



Fm. 402. Ficus carica. (After BAILEY.) 



the Cape region of Africa. None occur in North America, but species of Protea 

 (Fig. 403) are occasionally grown in greenhouses, and Grevillea robusta, the 

 " Silk-oak '' of Australia, is a common ornamental plant, and frequently planted 

 out of doors in California. 



Order XI. Santalales 



The Santalales comprise a large number of plants, often much reduced para- 

 sites, whose affinities are somewhat doubtful. The flowers are usually hermaph- 

 rodite, with a well-developed perianth. In many of them, the ovules are only 

 imperfectly differentiated, and the embryo-sac may be imbedded in the tissue of 

 the placenta, or even of the carpel. There are several families, two of which, 

 Santalacese and Loranthaceae, are represented in the United States. To the 



