| ON THE | 
CINCHONA FORESTS OF SOUTH 
AMERICA. 
BY A. VON HUMBOLDT. — 
SECTION It. 
Tue genus Cinchona belongs to those tribes of plants, whose 
species have been considerably multiplied of late. Linnaeus 
knew but two of them, viz. C. officinalis and C. Caribea. 
Vahl,* in his treatise on Cinchona Bark, enumerates nine ; 
Lambert,+ in his English Monograph; eleven; Persoon, in 
his little Enchiridium Botanicum,} one-and-twenty species. If 
we yet add to these, two Cosmibuene of the Flora Peruviana, 
belonging formerly to the genus Cinchona, the Cinchona excelsa 
of Roxburgh, found in the East Indies, my C. Condaminea, Vavas- 
sour’s C. spinosa, and Willdenow’s yet undescribed small-leaved 
C. brasiliensis, for which we are indebted to Count Hoffmann- — 
segg in the expedition instituted by him for objects of natural 
history, then the number of species of Cinchona appears to have 
increased to twenty-seven. The authors of the Flora Peruviana 
alone have entertained the notion of describing thirteen new spe- 
cies, while M. Mutis has reduced all the Cinchone, examined 
by him in South America, to seven only. Even Professor Zea, im 
. '* Skrivter of Naturhistorie Selskabet, B. i. H.i. p. 16. 
+ Description of the genus Cinchona, 1797. : ; 
+ Synopsis Plantarum, P.i. p. 196, 
