686 



BOTANY 



PART II 



native to the Mediterranean region and the Cape. Erica tetralix is distinguished from 

 the closely related Heather, Calluna vulgaris ( w ) by its corolla being longer than 

 the calyx ; both are abundant in Britain. 



OFFICIAL. Arctoslaphylos Uva ursi yields UVAE URSI FOLIA. Gaultheria pro- 

 cumbens yields OLEUM GAULTHERIAE. 



Order 2. Diospyrinae 



The Sapotaceae is a tropical family; the plants contain latex. Species of 

 Palaquium (Fig. 731) and Payena from the Malayan Archipelago are the trees 

 from which gutta-percha is obtained. Balata is obtained from Mimusops ; trees 

 found throughout the tropics. 



Ebenaceae. Diospyros Kaki is a Japanese fruit tree ; D. Ebenum, ebony. 



Styracaceae. The origin of Benzoin (BENZOINUM), an official resin, from 

 Styrax Benzoin, though generally assumed, is open to doubt. 



FIG. 733. Anagallis arvensis 

 (i nat. size). Longitudinal 

 section of flower, and cap- 

 sule at dehiscence (en- 

 larged). 



FIG. 734. Cyclamen europaeum. A, Entire plant. B, Fruit. 

 (After REICHKNBACH.) POISONOUS. 



