14 



Cx E G R A P n I C A L DISTRIBUTION 



62. The Forest Rfgion^ of Middle China. .Bounded by N. lat. 27° 

 and the Mil in mountain-chain, which stretches from West to East in 

 about the same parallel. The whole country originally overspread 

 with a forest. 



63. The Forest Region of Southern Japan. Including besides the 

 extreme Southern portion of the Corean Peninsula. Both countries 

 originally overspread with a foi-est. 



V. The Temperate Regions in Northern America. 



The plants almost everywhere exposed to the alternations of Sum- 

 mer and Winter ; provision being made for a cessation of the vegeta- 

 tive process during tlie severe cold of a portion of the year. Thir- 

 teen botanical regions may be distinguished. Colored grey in the 

 accompanying map. 



64. The Region of North California. Principally un wooded; bat 

 with thickets and groves on the mountains, and along the banks of 

 streams. Evergreen or perennial foliage predominating everywhere 

 on the trees and shrubs. 



65. The Region of Middle California. As far as the botanical 

 Tropic, in about N. lat. 27°. Unwooded, and described as being more 

 arid than the preceding region. 



66. The Northern or Oregon portion of the Great Interior 

 Table-land. ITn wooded, and almost everywhere arid and grey; at 

 no season tinged with refreshing green. The district that affords the 

 most remarkable Oregon plants. 



67. The SoNORAN portion of the Great Interior Table-land. 

 South of the preceding region, and extending to the botanical Tropic, 

 in about N. lat. 27°. The tace of the country described as decidedly 

 more arid ; with a predominance of spiny plants, as among others. 

 Acacia bushes, Cacti, and a Yucca. 



68. The Unwooded Region of the Missouri. In general grassy. 

 Towards the Rocky Mountains extending Northward beyond the 

 Saskatchawan and Athabasca rivers, where, according to Richardson, 

 "it comes to a point in about N. lat. 57°." 



69. The Unwooded Region of Arkansas and Texas. South of 

 the preceding region, and of the thirty-fifth parallel of N. latitude. 



70. The Forest Region of the Ohio. Extending Westward, in an 



