12 



GEOGRAPHICAL DISTRIBUTION 



Destitute of large shrubs, and thickly covered with low grasses; but 

 with various humble plants here and there intermingled. 



42. The Bolivian Paramera. Probably more arid than the Peru- 

 vian ; for the stream flowing out of Chucuito Lake loses itself, and 

 the Mountain of Potosi is described as many-tinted. The inversion 

 of the order of aridity on tlie Andes is probably gradual, and in pro- 

 ceeding from Peru South, may commence in Bolivia. 



43. The most elevated Summits of the Sierra Parime in Guiana. 

 Situated far inland ; one of them, seen by Humboldt, being " eight 

 thousand five hundred feet" in height. 



44. The most elevated Summits of the Organ Mountains in South- 

 ern Brazil. Some of these being above the elevation of seven thou- 

 sand feet, present well-defined traces of a distinct botanical region. 



45. The Mountain Region of Mendoza, on the Eastern Slope 

 OF the Chilian Andes. Probably for the most part, or altogether 

 unwooded; as Cacti are said to be in great variety, and unusually 

 abundant. Towards the Tropic, possibly continuous with the Bolivian 

 Paramera. 



46. The Mountain Region on the Western Slope of the Chilian 

 Andes. From the elevation of six thousand feet to that of ten thou- 

 sand, where visited by ourselves, in about S. lat. 33° ; but towards the 

 Tropic the Region may gradually ascend so as to be continuous with 

 the Bolivian Paramera. 



47. The Araucanian Forest Region. Confined to the Western 

 side of the Andes, until in the far South the wooded portions of 

 Terra del Fuego are reached and included. 



IV. The Temperate Europeo-Asiatic Regions. 



In all, sixteen botanical regions. Colored grey in the accompany- 

 ing map. 



48. The North Atlantic Island-Region. Exclusively European 

 in its character, though confined to the distant ocean Islands, the 

 Azores, Madeira, and the Canaries. 



49. The Region of Middle Europe. From the Baltic and the 54th 

 parallel of North latitude to the 43d, and from Ireland to the vicinity 

 of the Black Sea. A region, in its original condition, overspread with 



