318 Part II. Chapter 4. 
abundant and widely distributed in the ‚austroriparian area, are known to occur 
on the mountains at an elevation of 300 meters (1000 feet), or more. A faint 
indication of this southern element is perceptible as far north, as West Virginia, 
and southeastern Kentucky; while on the isolated granitic outcrops in northern 
central Georgia and northern Alabama, of which Stone Mountain is the type, 
it is so extensive as somewhat to obscure the main element of the flora round 
ce FE 
Fig. 12. Sassafras officinale Nees, an element of the deciduous forest formation of eastern N 
America from Maine to the Gulf of Mexico. After Die Natürlichen Pflanzenfamilien IH 2, d» 
about. Confining our attention to the mountains of Tennessee and 
Carolina above an elevation of 300 meters (1000 feet), we proceed t0 
the peculiarities of the flora and its affinity to the other floras. h 
The presence at this elevation of a considerable number of,austro-tipai 
species, which nowhere venture beyond the limits of their life zone, is on 
whole the most noteworthy fact in regard to this element in the ighi2) 
flora of the southern states. In studying this floral element, one soon reac 
the conclusion that it comprises two categories of species, which are 4 
v 
