328 ECONOMIC BOTANY OF ALABAMA 



DISTRIBUTIONAL NOTES 



It will be of interest to plant geographers and perhaps others 

 to group the species of woody plants together according to certain 

 similarities of distribution within the state. In this study two 

 extreme types hardly need to be considered : first, species so widely 

 distributed over the state that one would have to seek elsewhere 

 for their limiting factors, and last, those which are so rare here 

 that it is not safe to draw conclusions from the available records. 



In each of the following lists trees and shrubs will be com- 

 bined, and arranged in the same order as in the catalogue. Where 

 we have only one species, or all the Alabama species of a genus be- 

 long in the same category, the generic name only is given. The 

 names of evergreens are printed in heavy type, to facilitate certain 

 important generalizations. Where a name is followed by (x) it 

 means that the species extends farther in the direction indicated 

 (north or south or inland or coastward, as the case may be) in 

 some near-by state, so that its limit in this state is probably not 

 determined by climate or altitude. Of course it is not usually pos- 

 sible to mark the limits of a species by a sharp line, for most spe- 

 cies thin out gradually away from their centers of distribution, and 

 after one has apparently gotten entirely out of the range of a 

 given species a few scattered individuals may turn up farther on. 

 (This is especially true of those whose distribution has been modi- 

 fied by civilization.) So the following generalizations cannot be 

 considered as final. 



First we may consider the southern or coastward or lower al- 

 titudinal limits of species whose main distribution is farther north. 



The following seem to be chiefly confined to higher altitudes, 

 say above 1000 feet (and therefore to the northern half of the 

 state). 



Tsuga Canadensis 



Betula lenta 

 Ribes curvatum 

 Ribes Cynosbati 

 Prunus Alabamensis 

 Stewartia pentagyna 

 Azalea arborescens 



