CLASSIFICATION OF ANGIOSPERMS. 



599 



an oleo-resin that is official as Mastic in a number of pliarmaco- 

 poeias (see Vol. II). The wood of Scliinopsis Lorcntzii and .b\ 

 Balanscc, growing in Argentine and Paraguay, is known in com- 

 merce as Quebracho Colorado. It is red, very hard and contains 

 tannin, gallic and ellagic acids. 



The PiSTACio nuts or Pistacia almonds are obtained from 

 Pistacia vera indigenous to Syria and Mesopotamia and exten- 

 sively cultivated in the countries bordering the Mediterranean. 

 The kernels are used extensively in confectionery. The nuts are 



Fig. 330. Gallic acid: long orthorhombic crystals obtained from an aqueous solution. 



about 20 mm. long, somewhat quadrangular in cross section, and 

 the seed consists of two fleshy, green cotyledons. The seeds of 

 Buchanania latifoUa and other species of BucJiaiiania are used in 

 India much like almonds. 



Gums are found in several species of Anacardium and Sclero- 

 carya. Acajou gum is obtained from Anacardium occidentale. 

 Considerable sugar and citric acid are found in Mangos, the 

 fruit of Mangifera indica native of Farther India and Ceylon and 

 cultivated in the Tropics. A fruit used like lemons is obtained 

 from Dracontomelon mangiferum of Malacca and the Sunda 

 Islands. 



