-256 



BOTANY AND PHARMACOGNOSY. 



of plants belonging to the Moracecie is the source of arrow poi- 

 sons. The URARi POISON of Brazil is obtained from Ficiis afrox; 

 the [POH APROW POISON of Java and Borneo is derived from the 

 Upas-tree, Antiaris toxicaria. Many of the plants of the group 



Fig. 136. Hopvine (Humulus Lupulus): A, portion of branch with pistillate flowers 

 (f) and cone-like fruit (s) ; B, portion of rachis of strobile with two scales enclosing akenes; 

 C, pistil; D, hair from rachis; E, epidermis of scale; F, longitudinal section of akene show- 

 ing coiled embryo; G. surface view of bract showing epidermis and cells containing calcium 

 oxalate; H, cystolith of leaf; I, cystolith of stem; J, glandular hairs (lupulin). 



contain emetic principles, as the Cocillana park of Guarea Riis- 

 byi, a tree of Bolivia. 



The milk-juice of quite a number of species of Ficus yields 

 India-rubber or caoutchouc (p. 667), as Ficus elastica of the East 

 Indies, F. toxicaria of South America, F. elliptica and F. pri- 



