318 POPULAR ECONOMIC BOTANY. 



now cultivated in southern Europe and the West Indies ; — 

 Alexandrian, by several species mixed together, as C. obo- 

 vata, C. acutifolia, C. jEtkiopica, and almost invariably with 

 the leaves of a plant belonging to the Natural Order Ascle- 

 piadacece, called Cynanchum Argel ; — and Tinnevelly, by C. 

 elongata, an annual species, which, being carefully cultivated 

 and kept quite free from mixture of other species, is the 

 most highly prized. The same species yield several other 

 varieties, produced in other localities. The Senna Cassias 

 all produce yellow flowers, which, though belonging to the 

 Leguminous Order, have no general resemblance to pea- 

 shaped flowers ; the reader must therefore refer to Plate 

 XVII. fig. 87, and will derive a better idea from Mr. 

 Pitch's beautiful drawing than from the most elaborate de- 

 scription. The quantity of senna imported from all parts, 

 in 1852, was about 257 tons. 



The long round black pods, imported under the name of 

 Cassia-fistula, are seed-pods of an allied species, Catharto- 

 carpus Fistula (Nat. Ord. Leguminosce) , a tree found in 

 China and the East Indies. 



Peruvian Bark, Jesuits' Bark. — The dried bark of 

 various species of the genus Cinchona (Nat. Ord. Cincho- 

 nacece). (Plate XVII. fig. 88.) 



