XXXIII. MARCGRAVIACE^]. 



275 



proportion of slightly narcotic volatile oil; the leaves also contain a considerable quantity of casein, a very 

 nutritious substance, which is not soluble in water; whence the Tibetans, after drinking the infusion, eat 

 the boiled leaves mixed with fat, which forms a substantial food. The two principal Teas of commerce, 

 green and black, belong to the same species; their difference is simply due to a peculiar preparation of the 

 leaf before it is dried. Many varieties of green and black Teas are distinguished ; that called Pekoe 

 is a green tea much prized for its scent, which is given to it by the flowers of Olea fragrant. The Chinese 

 perfume other teas with various scented flowers, such as the Jasminum Sambac and Camellia Sesan'jua. 

 Many attempts have been made to cultivate tea in Brazil and in Europe, but the produce cannot be 

 compared with that from China. 



XXXHI. MAECGBAVIACE^E. 



(MARCGEAVIACE^E, Jussieu. MARCGRAVIE^E, Planchon. TERNSTRCEMIACEARUM tribtis, 



Benth. and Hook, fil.} 



itartgravia 



Inflorescence surmounted by saccate bracts. 



Maregravta. 



Corolla (tnag.). 



T 2 



